Both dramas involve the male lead with DID. The difference is that the two identities are played by two different actors in Bad and Crazy, which is quite unique and makes the story interesting.

An older drama of romance between a teacher and a student (before and after high school), starring Kim Ha Neul and Kim Jae Won - must watch classic!

Both dramas involve women coming together for revenge, with strong female characters and smart male lead.......

Both are melodramas that involve first love separated and reunited. Bonus - Park Jin Young is the younger version of the male lead in both dramas!

Both of these dramas involve someone who is already dead coming back to life to spend time with family and friends