İt is bl novel. MC was committing suicide. At this time, his brother and ml (if I remember correctly) were getting married. In fact, he felt extremely depressed because his family did not care about him. He blamed himself. Unfortunately that's all I can remember :/
Hmmm… sounds so familiar, is this story has a rebirth/ transmigration element for the mc. Cuz i think i read something similar… but i also forgot the title .. teehee