Seito Shokun!

Both are school drama, portraying a new teacher coming to class, and the students are against it.

Similar in theme to Seito Shokun:
Gokusen has a female teacher with strong beliefs who teaches them about life, friends and value of responsibility.

GTO, this time a former gang leader now turned teacher who looks to help his students.

Both dramas are school-themed, both with dedicated teachers who care deeply about their students, some of whom have lost their trust in teachers/adults.

Both dramas are school/dedicated-teacher themed, both with students who have lost faith in adults, and both are a great watch!

Both dramas are school/dedicated-teacher themed, and in both dramas, the students who are villainized by the schools are actually only victims who have been mistreated and labeled by adults.

Seito Shokun synopsis: "Students who do not trust teachers, teachers who give up faith in education, parents who blame schools for their children's misbehavior... Naoko was at a loss when she was assigned as a new high school teacher. Times have changed and students are no longer easy to control, but she chose not to look away. Instead, Naoko reaches out to try and discover the various issues hidden in the modern education system."