Older Woman/Younger Man romances. Both take place in a workplace/same industry setting.
Both are Chinese Dramas starring famous senior actresses & popular younger male actors.

If you liked the Female Lead in "The Villainess" then you'd like main character in "Coin Locker Girl" as well it's like they're cut from the same cloth both are cold, ruthless, and fierce to say the least. Both have blood on their hands, and yet they have a heart.
The endings were even slightly similar.

"Masquerade" with actor Lee Byung Hun in it, was the movie that inspired the Kdrama "The Crowned Clown".