The seme rejected uke harshly in high school and now years later gets nightmares about it. Then he sees uke at a bakery and tries hard to get close to him so that he can make up for his past mistakes. Uke ends up falling for him again. Seme rejected him (kinda harshly again) for the second time. Uke cuts off contact with the seme. Seme realises his feeling, regrets his actions and desperately chases after the uke to give him one last chance.
As an unexpected descendant of a cursed family of mermaids, Eunwoo's only hope of survival is to never fall in love. For years this was easy enough, until one day he's forced to confront his childhood friend and first kiss, Taeho. But why has he come back, toying with Eunwoo's heart? Can Eunwoo resist Taeho's pull or will he succumb to his hidden feelings, and ultimately, disaster?
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The seme was a tutor who fooled around with his student (uke) and later ditches him before joining med school. Years later, he meets uke again as his doctor, recognises him but keeps it a secret and thinks he can restart the fling. Uke again falls in love with the seme. The seme was playing with him in the start but later becomes serious. Then uke gets to know about the seme being the tutor from before, feels betrayed and breaks up with him. This marks the starting of seme's chasing arcs.
The uke is a very sheltered guy from a rich family. The seme is his mother's new boyfriend. Seme gets weirdly close to the uke. Seme ends up making a move on the uke. Ends up deceiving the uke and his mother. Realises he actually fell in love with the uke. Regrets his actions and apologises for his past actions.
The seme is very obsessed with his high school first love (uke). After he confessed, uke harshly rejected him saying "I'll consider it if I become a woman". Years later seme drugs the uke and turns his dick into a pussy. Uke has no choice but to stay with him and do as he says. Seme later ends up regretting hurting the uke with his actions.
The seme is an assassin sent to kill a family but ends up sparing the live of a young boy (uke) because he once saved seme's life. Unaware of this fact, the uke later urges the seme to teach him so he can get revenge for his family. As time passes, seme starts to fall in love with the uke and regrets killing uke's parents.
The Third Ending