Jae-Shin x Lee Nok
Jae-Shin, son of Yama, carelessly plays with the Book of Fate when he alters a human's lifespan that he exchanges with the man's son. As punishment, he is sent to the human world where, by day, he is a puppy and by night, a human with the task of wining a human's true heart so he will understand them better.
Night Song