Dear Sa-chan, if only I’d had sex with you that time, perhaps I wouldn’t have wandered d...
ML cheats on FL because he lacks basic human emotions. He later confesses to MC and expects her to be perfectly okay with it. She was for a while but breaks up with him and ends up with a good guy. ML spends the rest of his life suffering until the insane plot twist at the end that made me want to gouge my eyes out