Looking for a Korean manhwa

Does anyone know this one manhwa where it’s a modern academy setting with the society norms are based off their “ranks” or “elos”? The main character has a S/SS skill (its between those two) and he pretends to be gullible. When his skill activates he loses control and goes manic, trying to kill everyone. His weapon is a dagger iirc. His awakening was caused by his uncle/aunt. There was this one episode where they got caught by some evil folks in the police station while his year(?) was on a field trip (?) then his classmates got caught up in the bank/police infiltration (or robbery, idk)