Both dramas follow the main couples love through many lives.
The male lead in both shows are in a position where they hold a lot of mystical power, and the female in the current lifetime the TV show is set in doesn't remember her past with the male lead.
All in all both dramas are very similar.

Both main female leads believe that the people around them love and adore them. It takes a supernatural event to uncover the truth behind the fake smiles of their peers.