engeneinc
Heeseung is a centuries old vampire. He's so old to the point where he's lost all sense of time. All that changes when he gets a letter.
He has a single descendant left. A child whose parents just died. Heeseung takes him in, but he's totally unprepared for raising a child like Riki. Riki is wild, energetic, and almost never stops talking.
That's when Heeseung meets Jungwon. Jungwon quickly becomes an integral part in Heeseung and Riki's lives, and Heeseung finds himself slowly falling in love with Jungwon and the life he represents.
But Heeseung is immortal. And immortality means he'll someday have to watch as Jungwon and Riki grow old and die while he stays exactly the same. He can't bear the thought of it. So he gives it up. He gives it up to spend a single lifetime with the two people he's come to care about most.