Youshin, a university student studying medicine, was just chilling in class as usual, but today something strange happened. A new person was going to join his class, only for him to realize that the new guy was actually the person he had marked seven years ago. Of course, excited that his long-lasting crush was back, Youshin forgot that there was one problem: does he even remember him? Well, there's no real problem—he could just get close to Seoyun again. But something tells him it will take quite some time to rebuild the bond they once had.