Big Brother (2018)

They are basically about a teacher that is in charge of a class that has no discipline. the teacher is able to connect and help out in the students lives and motivate them to study and think of their future.
a plus both teachers are really good fighters and end up getting into fights, which gives it some interesting content to follow.

Both Big Brother and The Man Who Kills Troubles are about soldier/mercenary turned teacher who do their best to educate youth using means they learnt in their previous careers.

The GTO Series (Movie / Series / Anime) is also about a dilettante teacher who helps out his rebellious students from different difficult situations with unconventional methods, mixed up with some martial arts move. Fun to watch.