Both of the male leads are magical beings. In both dramas, the female leads give me the same feeling, they are for example very obsessed over the male lead. If you enjoy a fantasy/sci-fi story I would recommend both of them.

Reincarnation, meeting past lover again.

One of the characters doesn't know that his/her past lover has been reincarnated.
Both still harbor feelings towards each other.

These drama are similar because of
- Fake death
- Hidden identities
- Undercover operation
- Meeting people again with another identity