1000 years old

Synopsis:

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 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.

(Source: Thai = WeTV || Translation = MyDramaList)