Looking for el manga

It's a korean webtoon?? from ages ago about this dude that looks like a total delinquent and goes to an (almost) all-boys school filled with other delinquents. Cos he looks like a thug everyone tries to fight him and he ends up winning everything by sheer luck, ex: he trips and knees the opponent in the face. There's also this red-haired? chick there that everyone thinks is a crossing dressing guy bc its basically an all-guys school; they end up together.