Thi, a college student, had a part-time job as a tutor. One day, one of his students got into trouble with high-school gangsters. Thi went to protect his student and confronted the leader of the gang, Noey. After that day, Thi ran into Noey so many times, he started to learn that although Noey had a badass look, the boy was ridiculously silly. Noey just came up by himself that Thi was running after him. Thi was so done trying to explain that he had zero interest in him, but fate played funny tricks. Thi was contacted to be a tutor for a new student. That student was Noey. They learned more about each other. Noey started to change himself and made a move on Thi.

Though enigmatic loner Pun has lived an exceedingly long life, he hasn't aged past about twenty-five. Yeah, Pun isn't some ordinary human. He has the blood of what some may call a vampire. Pun lives alone, modestly—like any regular person. One day, he meets a student named Yo. Yo becomes the first person Pun trusts and accepts into his life, and, without either realising it, that thing called love begins to develop between human and vampire.