In both, a teacher is confronted with their students commiting a murder.
In Confessions, it's the teacher's daughter. She then tries to get revenge.
In Saiko No Kyoshi, it's the teacher herself, and she go back in time to prevent that.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

Both drama feature an adult trying to fix a messed up school.
In Saiko No Kyoshi, it's a teacher that manages to go back in time after being killed by their student, while in Ao no SP, it's a policeman assigned to work in a school.

Both drama feature students trying to kill their teacher.
Saiko no Kyoshi is more realistic, while Sensei wo Kesu Houteishiki can be a bit over the top sometimes.

Very similar plot.
An atypical teacher tries to change their evil students.
In Saiko no Kyoshi the teacher went back in time after her students killed her, in Ore No Sukato, the teacher is a man dressing as a women.

- Thriller / Mystery
- School isolated from the outside world with students having to manage on their own

Isolated "prison-like" school with few wealthy students locked up
Thriller / Mystery vibes

School and bullying, revenge, etc..

Homicide mystery in both.

- Introduction scene happens in a train
- Feature zombies
- Tense and eerie atmosphere

Train to busan is about people getting stuck in a train when zombies outbreak happens.
Last one standing is about people taking a train, but the train arrive in a mysterious island filled with dangers.
In both drama, the characters will need to survive.

Idol Producer is a chinese survival show from Iqiyi.
It's the first chinese of produce 101 and was a big hit at the time.

This one has a lot of trainees that became extremely famous in China due to it.