HeartBeat - Season 1 Episode 1 Ah.. I told you not to open it until 100 years.
Overview: Vampire Seon Woohyeol has one desperate wish: to become human and experience heart-pounding love. He tried many ways to become human, but none of them worked. After hearing from a 1000-year-old cat that he can become human if he sleeps in a hawthorn coffin for 100 years, he enters the coffin for a lengthy slumber.