The movie gave me the feeling of truancy, the school is a group of mischievous students, and then forced all kinds of new teachers to quit their jobs, the male protagonist is specialized in all kinds of disobedience, the male protagonist's job is a substitute teacher, all kinds of naughty and mischievous students have seen and can be subdued.

The man is in class
The teachers who can stay in this school are not ordinary people.
There is also an old man in the school, who can also control various scenes, very humorous. This old man is very funny, anyway, I am laughing. For example, when this old man taught the girl who was dressed without underwear, he took two photos, a sunset and a **, and I don't believe you can see it yourself.
Humorous old man
The male protagonist's grandfather has Alzheimer's disease and lives in a place similar to a nursing home, but the staff of the nursing home did not fulfill their obligations and was frightened by the male protagonist's reprimand, and the male protagonist is a person with a very good personality.
The male protagonist in the movie is also constantly recalling his childhood, of course, it is all pain.
Of course, there is also a chicken (hungry) hungry girl, the school's fat girl, the school's female teacher, etc., and the story of the male protagonist, everyone is interested in seeing it for themselves.
School female teacher
It may be that the students' grades are not good, and then the principal is dismissed, the school is empty, and the end of the movie is that the male protagonist attends classes in this dilapidated and empty school, which has existed before, or has the male protagonist imagined it?
Good sentences from the movie:
That thing doesn't feel anything, it's empty, and I don't have any feelings that can hurt you, see?
You see, most people lack self-awareness. Unfortunately, you'll meet sbs later, every year.
Listen to me, I don't care how old you are now, you can't go on like this, you know, you will understand, human youth is very short.
Humor is good, but humor generally ends in tragedy.
Even if you know it's fake, you deliberately believe the lie.
To protect ourselves and prevent boredom from penetrating into our minds. We must learn to stimulate our imagination and cultivate our own consciousness through reading, which we need to protect and guard our own minds.
We are born this way, there is nothing we can do but accept the bad reality.
We are all the same, we all feel very miserable, we have messy things in our lives, life is very puzzling, life will slowly get better.
We all need something that frees us from the tediousness and reality.
We all have a responsibility to guide young people in case they go down the road of no return and become fragmented and self-abandoned.
I'm not here, you may be able to see me, but that's just my shell.
Failure, in a sense, is that we have let everyone down.