Not cheerful on the outside (receptive).
Thin-skinned but very gentle (attack).
It's probably the protagonist's high school life.
Mou Zhongyun pretended to be a bad student and got into the No. 1 Middle school, and continued to pretend to be a bad student for more than a semester. After more than a semester, he got a classmate who was number one in grade. However, he found that the classmate was his former friend and didn't remember him at all. Then he started teasing his deskmate, and finally got himself involved...
Mou: But her reaction is really funny, what should I do if I can't help it?
Intention: crazy