O Professor Vermelho (2016)

Both are 1-episode drama specials.

In both specials the main lead comes into possession of banned book that causes them issues and changes their life drastically.

Modern Girl focuses on a friendship between lady from a noble family and her handmaiden. The story is set during japanese colonial rule.

The Red Teacher focuses on friendship between teacher and his student. The story is set in 1980's

Both dramas are set in 1980's and revolve around high school students and how are their lives affected by political situation of the country. Both main female characters are very similar to each other and overall both dramas have similar feeling.

I highly recommend both!