Both have immortal male lead characters who suffer from their fate until the female lead frees them. One thing I found similar was that both male lead characters had guilt and pain and constantly had to bury people throughout the time they were alive

The ML's sister is in a "sham" marriage, the annoying SML who can't let go of the FL, FL trying to leave one complicated relationship to get into another that's equally complicated, cute and affable ML pursuing the FL first, even the aesthetic on the poster looks the same