Antihero male lead who is extremely physically capable.

Sizzling chemistry between male lead and older female lead.

Introduction of a younger female lead who is more innocent and serves as romantic interest.

Same writer and emits similar vibes.

Yong Pal has strong "Sleeping Beauty" vibes while The K2 is based off of "Snow White."

Both has near perfect characterizations of the male lead.

Lots of political intrigue and strange psycho characters.

Both about past lives and how that affected the characters' current lives.

In both dramas, the leads remember their past.

Both have supernatural elements outside of the past life/future life trope.

Both have wonderful OSTs. CT is more artfully done while Legend is more quirky and fun.