Lee Jeno a reserved high schooler who is living his own life minding his own business, discovers one of his classmate Renjun, secretly suffering from a fatal pancreatic illness. Huang Renjun cheerful, popular and bright kid who is living the life everyone wish that they could have is suffering from a fatal illness. Only his family knows about his terminal illness; not even his best friend Jaemin aware. Na Jaemin has a very unique personality. No one can predict what will he do next and he has no interest in others. He's curious why Renjun is suddenly interested in reserved kid and gets jealous when Renjun started to give more attention to Jeno. Will the secret bring the three of them together or break the bond between two best friends? **Inspired by I want eat your pancreas**