Hooligans are not afraid of three things: not the sky, not the earth, and not the teacher. Teachers have three treasures: they can go to class, they can go to the kitchen, and they can fight gangsters. Until the female gangster Nan Mu met the new substitute teacher, she changed her sentence to "I am not afraid of heaven or earth, but I am afraid that the teacher is educated."
It's a little cruel but a little sweet, welcome.