Kyojo

Both shows give us a closer look about Japan's police academy, Beginner is more of a "slice of life" drama while Kyojo having a more serious approach.

-both of them depicted the life being a police academy student.
-the academy students tried to solve real crime by themselves.

1. Both are serious school-based/education-based dramas where a strict teacher pushes students to face uncomfortable truths.
2. Both are mystery dramas with antihero main leads.
3. Both involve psychological pressure and mind games.