If you loved Define the Relationship, chances are you'll really enjoy The Origin of Species, Under the Moonlight and the others too. They share that same energy—whether it's the intense Drama, Romance, or just the vibe that keeps you hooked. While you wait for the next chapters to drop, it’s the perfect time to explore something new that still feels familiar. These picks aren't just similar—they're fan favorites for a reason, and they might just become your next obsession.
1. The Origin of Species
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Drama, Fantasy, Hentai | 80 | 69/100 |
Lee Young-Jin has never been like other Omegas. Rather than being physically superior to humans like the rest of his species, Young-Jin is a gifted hacker. But when his talent leads him to an ill-fated heist mission, Young-Jin finds himself trapped in the clutches of a powerful Alpha businessman named Seo Seung-Hyun. Now, he must do anything he can to guarantee safety for himself and his colleagues - even if it means sleeping with the enemy. But as the business deal between Young-Jin and Seung-Hyun quickly becomes more personal, will they be able to see eye to eye? Or will their differences be too much to overcome? Set in the Omegaverse. (Source: Tappytoon)
2. Under the Moonlight
Synonyms: Bitten by Moonlight
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Fantasy, Romance | 7 | 67/100 |
As the formidable vampire lord, Ayla is more than capable of concocting whatever evil schemes he desires. But he would much rather spend his time gallivanting across the continent causing trouble for both demons and humans alike. Which is why even after he’s finally returned home after 17 years, he’s delighted to be greeted by a dark aggressive assassin out for his neck rather than peace and quiet. However, upon closer look, Ayla discovers something much more unexpected about this mystery man. The first is that he’s been hypnotized, and the second is…this man’s body is completely Ayla’s type! (Source: Lezhin US)
3. Odd Love
Synonyms: 单恋, Exotic Love, Amor Destructivo
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Drama, Romance | 64 | 68/100 |
On the outside, Jeong Jaehan has it all. He’s a third-generation chaebol in charge of an incredibly successful film production company. Despite all the power and money, he’s been secretly suffering from a torturous ailment. After years of drugs and alcohol abuse, he’s lost the ability to orgasm- or so he thought. When someone from his past unexpectedly shows up, Jaehan experiences pleasure that he thought he’d lost forever... (Source: Lezhin US)Note: Includes 19 extra chapters.
4. Kiss me, Liar
Synonyms: 甜蜜真相, Bésame Mentiroso
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2019 | Drama, Romance | 48 | 64/100 |
Yeonwoo is a perfectly competent secretary. However, he’s secretly in love with his boss, an extreme alpha named Keith, who has zero interest in male omegas. After a traumatic incident leaves Yeonwoo fearful of all alphas but Keith, he resigns to hide at home. Keith, inconvenienced by the absence of his trusty secretary, takes on the task of helping Yeonwoo recover. Will proximity and pheromones cause love to blossom in this working relationship? (Source: Tapas)
5. Kiss Me, Liar SE
Synonyms: Kiss Me, Liar Special Episodes
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Drama, Romance | 32 | 63/100 |
“Even now, when I think about it, my teeth grind, I was fooled.” Yeon-Woo, who had a crush on Keith and became true lovers, will he be able to break the long chain of lies? A sweet and creepy spin-off of Kiss Me, Liar!
6. Do You Still Like Me?
Synonyms: Still, Do You Like it?, Geulaedo, Joh-ahae?, 這樣，也喜歡嗎？
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Psychological, Romance | 74 | 66/100 |
After a bad break up with his first love, Jin-U falls into a creative slump with his ceramic art. During this slump he meets Colton, an alpha with whom he has a history. As things get steamy, it’s clear that they both have an agenda. And soon enough, the situation starts to get a whole lot more complicated. It was bound to, especially when pheromones are involved… (Source: Lezhin US, edited) Note: Chapter count includes 16 side stories.
7. Hold Me Tight
Synonyms: Heating-Up
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2018 | Drama, Romance | 191 | 77/100 |
Every day of Giovanni’s life has been cold. Despite scorching summers, sunny springs, despite being the president of an uber rich company, he is incapable of feeling warmth, numb to it all. Then, he met Felix. Shy and seemingly innocent, Felix’s touch is the first heat Giovanni’s felt in a lifetime. Lust or love, Giovanni hires him as his personal bodyguard, but are Felix’s true motives so warmhearted? (Source: Tapas) Note: Includes 30 side story chapters.
8. Dawn of the Dragon
Synonyms: Dawn, Clouds, River, 拂曉、雲朵、江水, 夜明け、雲、そして河
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2022 | Drama, Romance, Supernatural | 75 | 75/100 |
As the heir to the Yooshin corporation, Yoo Taehyuk is living his best life. However, everything changes when he’s informed that the dragon, the patron deity of the Yoo family, wants to forsake them to be with his mate. When his sister is asked to take the fall for the family and announce herself as the dragon’s mate, Taehyuk steps up instead. He agrees to meet the dragon in the hopes that he can convince him to stay. But will Taehyuk succeed in slithering into the impervious dragon’s good graces or get under his scales? (Source: Lezhin US)
9. Mad Place
Synonyms: 疯狂之地/疯狂之境, Mad Place〜二人を狂わせた場所〜
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Drama, Mystery, Romance | 68/100 |
Seconds after winning his case, Sehyuk is immediately called to investigate another murder - this time, with a suspect who claims to be his biggest fan. Ideun, the suspect in question who holds the key to the investigation, requests a "private" sitting with Sehyuk, in all essence of the word. As the mystery unveils, unpleasant truths and painful memories rise to the surface once again, plunging Sehyuk deeper into madness. (Source: Lezhin)
10. How to Snag an Alpha
Synonyms: How to Chase an Alpha, Como Atraer a ese Alfa, Como Conquistar Um Alfa
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2019 | Comedy, Drama, Romance | 107 | 73/100 |
Born into a family of handsome, wealthy, and well-educated alphas, Woo-Young always expected he would be the same. Come to find out, he was the odd man out as the lone omega, and not even a perfect one at that. To compensate, Woo-Young goes through life pretending to be a beta, but when he begins to experience hormone imbalances, irregular heat cycles, and a distinct lack of control over his impulses, his lowly recessive omega status becomes impossible to ignore. That’s when he meets Kyung-Ju, a powerful and successful dominant alpha who can turn him into a true omega, and also makes him weak in the knees. Now, Woo-Young must use every tactic there is to court Kyung-Ju and make the brooding alpha his very own. (Source: Tappytoon) Note: Chapter count includes a prologue and 23 side story chapters.
11. Scentless Trail
Synonyms: Unscented Orbit, Unscented Trajectory, 무향 궤도
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Drama, Romance | 81 | 57/100 |
Childhood tragedy turned Lee Ju-Hyeok into an angry, omega-hating alpha. He has enemies, his partners can’t pleasure him, and he can’t remember the one dearest to him. However, his right-hand man, Kwon I-Hyeon, knows who he once was and chooses to stay by his side. But after an incident results in the two eloping, Ju-Hyeok’s urge to have I-Hyeon all for himself begins to grow. His demands are getting worse, and it’s only a matter of time before there’s nothing left of I-Hyeon… not even a scent. (Source: Tapas) Note: Chapter count includes a special chapter and a prologue.
12. Wolves Behind Bars
Synonyms: 개와 늑대의 시간, The Time Between Dog and Wolf , L'heure Entre Chien et Loup
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2019 | Hentai, Romance | 78 | 64/100 |
Kiyo, a struggling young artist, suddenly finds himself pinned as the prime suspect in a serial murder case. And as if going to prison wasn't enough, he's thrown into an Alpha-only facility crawling with thirsty alphas who are all too eager to eat him up. Thanks to his mysterious new cellmate Iri, Kiyo is able to escape their clutches, but bigger problems await... (Source: Lezhin) Note: The chapter count includes 13 special episodes and an epilogue.
13. Dear Benjamin
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Action, Drama, Hentai, Romance | 45 | 72/100 |
All Isaac the beta wants is to live a normal life as a slightly unskilled florist and leave his turbulent past behind. That dream quickly goes out the window, however, when the infamous arms dealer Felix waltzes into his shop and takes a liking to him. It just so happens that Isaac's family needs protection from a mysterious enemy, and luckily, Felix is more than willing to provide it in return for Isaac's body. The more Felix falls for the reserved florist, the more he wants to unlock his many secrets. And as things heat up in the bedroom, Isaac finds it harder to resist the handsome alpha and his powerful pheromones. Meanwhile, the secret about their shared past hangs in the air like a ticking timebomb...(Source: Tappytoon)
14. Hotel Ojakgyo
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Hentai | 6 | 48/100 |
The Chilseok festival is coming soon and there will be a gathering at the Hotel Ojakgyo to celebrate the event. However, in reality, the event is actually for alphas and omegas to come together to have an orgy! Im I-Jun is a rare, high-quality omega. Omegas of his stature are desired by many. Even so, Im I-Jun has always liked his close friend, Kang Do-Hun, who is an alpha. However, Si-Hun, another alpha, has his eyes set on Im I-Jun. What is to happen when the day of the festival finally comes?
15. Staff Only
Synonyms: Help Me, Teacher
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Comedy, Hentai | 10 | 64/100 |
When presumed-beta Yoo Hansol visits the doctor for some concerning new symptoms, he’s surprised to discover that instead of dying, he’s actually an omega! Totally unused to the realities of being an omega, Hansol forgets his suppressants, starting a chain reaction he couldn’t possibly have imagined. Nearly passing out on school grounds, Hansol is quickly rushed to the school nurse by the hunky gym teacher. The thing is, at this stage, there’s only one way to soothe an omega in the throes of heat…and two oh-so-sexy alphas who are more than happy to help. (Source: Lezhin US) Note: The chapter count includes 6 extras.
16. Hold Me Safe
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2020 | Drama, Hentai, Psychological, Romance | 50 | 64/100 |
Is it a good or bad idea to have your ideal type as your bodyguard? Young bestselling author Han Jaehwa is about to find out. With three hit novels and a slew of film adaptations, not to mention a flood of media attention for his chic good looks, Jaehwa seems to have everything going for him…but fame comes at a price. After a stalker breaks into his home, Jaehwa decides to hire a bodyguard for some inner peace. Seong Taekyung is seasoned and capable, everything you’d want in a bodyguard. The only problem is that he’s way too hot, and Jaehwa can’t keep his eyes off him. Hounded both by a stalker and by his own turbulent feelings, Jaehwa must face not only the enemies of his past but also his own longstanding intimacy issues with Taekyung's help. (Source: Lezhin)
17. Mastering the Secretary
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2022 | Romance | 5 | 60/100 |
Secretary Han has been working for the same family for years, so he watched the young master of the house grow up and has always doted on him. But now his beloved young master has taken a special interest in him. Unable to say no to his beautiful young master, they start a steamy sexual relationship. However, Secretary Han is in for an unexpected surprise because his master is going to show him what it’s really like to be under him. (Source: Lezhin US) Notes: - Chapter count includes a prologue - First published on the author's Postype in 2020
18. Cry Me a River
Synonyms: Ahogado por el deseo, Liebe und lust, ใคร่ราคะ
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2023 | Drama, Romance | 64/100 |
Desperate to save his father from crushing debt, Mi-eum is compelled to accept a risky offer from a ruthless loan shark. The terms are clear: assume the role of a house servant and get close and gather vital information about the enigmatic young master of the house, Baek Jitae. Upon entering his new workplace, Mi-eum's mission takes an unexpected turn as he's assigned to assist Jitae with an unusual task - his bath. Mi-eum understands that this unique opportunity is his key to getting closer to his target. Yet, the moment their eyes meet, Mi-eum realizes that no matter how much he may cry and weep, there is truly no turning back now. (Source: Lezhin)
19. Honey Trouble
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2022 | Fantasy, Romance | 64/100 |
Attached at the hip for 20 years, Jiheon and Wooju are practically inseparable. There's definitely something simmering between them but Jiheon is an alpha and Wooju, just a beta. Not only that, but Wooju’s had his eyes on someone else lately, anyways. Ever the good friend, Jiheon makes an unexpected suggestion to Wooju in order to get the attention of the one he desires. But is there a layer of manipulation beneath this supposedly helpful gesture? What Jiheon feels is love, some might call…an obsession. And this obsession could lead to all sorts of trouble... (Source: Lezhin US)
20. Minmotion Syndrome
Synonyms: Minmotion Syndrome, ンモーション〜飼いならされた男〜, Dangereuse Essence
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2022 | Drama, Fantasy, Romance | 93 | 69/100 |
“I’ll repay that 450 thousand for you…but in exchange, you’re mine.” Due to the debt left behind by his father, alpha Seo Taeyoon is at the mercy of Park Jae-in, a mob boss with a penchant for violence. But when Taeyoon is able to identify Jae-in as an omega by scent alone, the ruthless criminal is taken aback – because nobody should be able to smell his pheromones. Seeing this as his opportunity to regain what once was lost, Jae-in offers to pay off Taeyoon’s father’s loan in exchange for a life of servitude. Now Jae-in holds the key to both the physical and metaphorical locks around Taeyoon’s neck. And so begins their relationship as master and slave...but there's no telling how it will end. (Source: Lezhin US)
21. Love Shuttle
Synonyms: 恋人パシリ〜遺伝子の発現にはご注意を〜
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2019 | Romance | 98 | 74/100 |
There’s a late bloomer, and then there’s a late bloomer. Do-Yun may be half Omega, but he certainly doesn’t look it: he’s tall, chiseled... But the worst of it all is that he’s a full-grown adult male who has yet to go into heat. He doesn’t see the problem, and everyone assumes he’s an Alpha, anyway. But when his body finally decides it’s “time,” it just happens to be at the most inopportune moment. He has no-one to turn to but his work rival, Tae-Han – but thankfully, Tae-Han is more than man enough to help him out. (Source: Lezhin US) Note: Chapter count includes 14 extras.
22. Cheongchun, Yechan
Synonyms: An Ode to Youth, 青春禮讚, ビバ！青春〜２つの恋のカタチ〜
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Romance, Slice of Life | 88 | N/A/100 |
"I'm different from that person, too different!" Cheong-Uk and Un-Ho have been living together for three months due to unavoidable circumstances. The two people who don't match at all end up clashing and fighting over trivial things. Their anger towards each other builds up and before they know it, they're on the verge of exploding, but Un-Ho ends up revealing his secret to Cheong-Uk...! Will Cheong-Uk and Un-Ho be able to get along without any problems in the future?(Source: Bomtoon, translated)
23. Omega Complex
Synonyms:
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2022 | Drama, Romance | 51 | 74/100 |
Yoon-Woo and Tae-Gyeom have been best friends since childhood, but Yoon-Woo is hiding a secret that could tear them apart–he’s an omega… and he’s in love with Tae-Gyeom. When a traumatic event leads Tae-Gyeom to despise all omegas, Yoon-Woo is forced to keep his identity a secret. After struggling for years to avoid Tae-Gyeom, they both end up at the same college, and Yoon-Woo’s carefully guarded secret is in danger of being exposed… (Source: Tapas) Note: Chapter count includes ten side story chapters.
24. Match Rate 99.99%
Synonyms: 99.99% Lovers, 99.99%の恋人~俺の子を生め!~, Compatible à 99.99 %
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Romance | 51 | 54/100 |
In the world of modern omegaverse, Hae-Jin is an average office worker with a spirit of adventurer who happens to be the omega that Hwan Lee, a sharp-looking and ambitious corporate executive has been searching for. Hwan, who needs a matching omega with a sufficient compatibility rate in order to have him bear his child, offers Hae-Jin an overwhelming deal that is too sweet to be rejected.(Source: POCKET COMICS, edited) Chapter count includes 6 side stories.
25. Full Volume
Synonyms: I can hear it without a microphone, Maikeu Eobs-ido Deullyeo, 隔壁鄰居直播中
| Year | Genres | Episodes | Score |
|---|---|---|---|
| 2021 | Comedy, Romance, Slice of Life | 128 | 73/100 |
Do-Won has a problem. His neighbor, Beom, seems awfully rude, but he’s infuriatingly gorgeous. And the completely ridiculous cherry on top? Beom turns out to be Do-Won’s all-time favorite camboy, which only adds to the (sexual) frustration. Beom is a metaphorical pain in Do-Won’s ass, and Do-Won would like to return the favor physically, thank you very much. So, Do-Won has a problem—in his pants. The question is, how is he going to solve it? You’ll find out the answer if you crank the volume up, and watch very, very closely… (Source: Lezhin)
If you're anything like me, once you finish something amazing like Define the Relationship, you're left wondering—what now? Luckily, there’s a whole world of stories out there that give off the same energy, whether it’s the intense fights, emotional backstories, or just that feeling of being completely hooked. The titles like The Origin of Species, Under the Moonlight... I’ve shared aren’t just similar—they feel right. They hit that same nerve that made Define the Relationship special in the first place. Of course, everyone’s taste is different, but I really think you’ll find something here that pulls you in. And hey—if you’ve got a favorite that didn’t make the list, I’d love to hear about it. I’m always looking for my next obsession.