In which movie did Ge You play the teacher?

In the movie "Shang Dang", Liu Shan, played by Ge You, signed a temporary contract with a middle school and became a substitute teacher while waiting for an immigrant visa.

Ge You's monologue: I don't know whether I am happy or sad. I almost fainted, and my temperament is not a teacher.

With his thin body, thin cheeks and bare back, Liu Shan really can't be called a teacher from the outside, but when dealing with students, he has an exclusive trick to win.