Does anybody remember this book? It goes like this: Felix’s brother is BangChan who disappeared for 2 years. But one night he came in to Felix home and asked him to help him. The request was since Felix was a med student, and his friend (Mafia gang) was hurt, and they couldn’t trust nobody, he asked him for help. He got really mad for leaving him and then coming back just to not say anything but their relationship as brother. I forgot the ending but I know it was either a Seungmin x Felix or I.N X Felix..