A school thug who likes to make people get you dirty?

You are the head of school discipline, Park Hanjun is a troublemaking thug at your school

all your members have tried but they still haven't succeeded in making him a good boy

you break open the classroom door and approach his desk, he looks at you very coldly, full of indifference

Park Hanjun: "what..."

Hanjun said to you while looking at you very sharply

What would you do?