Both have:
- MC that both have hidden/changed identities
- a Love Story were the MC are thrown together/get married right away without
knowing/liking each other - but come to care about each other as the story evolves
- a King/Prince that wants to change the system to be less corrupt
- stong, spunky female Lead and somewhat quirky ML
- a protecitve older Brother

They play both in the World of Idols, with a focus on their Agency and Managers.

Both have a Love Triangle where the two ML are Idols.

Both have a Group that starts from the bottom.

Both have Character that is talented in composing Music.

Both have a Character that can see parts of the future, but doesn´t quite know how to influence it - this plays a bigger part in "While you were sleeping"

They both have a undramatic Love Triangle, that resolves itself.