What kind of person is Mr. Hu played by Xiaogang Feng in Sunny Days?

First of all, Mr. Hu is a teacher. He is a bookworm. His lines are "sit down", "put down your hat and go back" and "ask someone to hit me". This is a pedantic teacher. His white short-sleeved shirt, his glasses and his tone are all the same. Teacher Hu's blackboard writing can't be said to be neat, but the title is extremely serious. After writing, wipe it on both sides, and Mr. Hu explained it concisely and clearly.