Grande Professor Onizuka (1998)

It have similar story (ex-delinquent turned teacher) and the teacher help the students to become better. GTO is a bit darker than Gachi Baka!

It's a similar story, with a sort of shady guy coming in and befriending a class, and the star also has awesome facial expressions.

The main character and the episode type are similar. The main difference is that GTO is set in a school and IWGP is set in the street.

Both dramas take place at a school. Both dramas have a cool main character and both dramas focus more on real life social problems of school than romance.

same plot line, different characters.

The theme used in both of the drama is quite the same..

It's about school life.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

I would say GTO is much better quality. You can watch any GTO anime or series. Both are about right and wrong.. and daily life situations. even though settings and plot is different, main ides stay kind of the same in both dramas.

Both series are about teachers that come to make order in a school. Both are about helping troublesome children. Both are comedies.