“I don’t even want to breathe the same air as a bastard like you!” ...That’s what he said before, Haesin’s stepbrother, Sangheon, who’s now living with Haesin after ten years. There’s Sangheon, who destroys the house whenever he gets the chance, and then there’s Haesin, a big pervert. The two stumble upon a cohabitate romance! Will they be able to live peacefully together while breathing the same air?