I'm the OP Protagonist—Why Would I Take This Abuse?

After eighteen years conquering another world, Su Chen returns home only to find himself trapped in an angst novel—complete with a useless "suffering system" that expects him to play the punching bag. But he's not that kind of protagonist. Scheming fiancée? Her family's bankrupt by morning. Delusional brother chasing a manipulative ex? One slap solves that. Mistaken identities, love rivals, and crematorium-chasing arcs? He'll bulldoze through this toxic drama in a month flat. When you're used to slaying demon lords, petty romantic schemes don't stand a chance.