The similarity : AWESOME VILLAIN !

Eventhough Liar Game and YWCFTS are a completely opposite drama when we see them from the genre,there is one fact that you couldn't deny:
Both of this drama cast Shin Seung Rok as the antagonist...
And it suits him well...
HE KILL IT!

I think if you're looking for a drama with an amazing antagonist character,you should try to watch Shin Seung Rok in Liar Game & YWCFTS ;)

Well... The main similarity between both of these drama is the theme. Do you enjoy the psycological-theme dramas?

If you do...

It's Okay,That's Love & Kill Me,Heal Me both have a psychiatrist female lead and a mentally ill male lead for you! ^^

Love to see some funny comedic scene? Go check Kill Me,Heal Me >>
Craving for some adult-passionate-but-sweet romance? Watch It's Okay,That's Love now!!!

Both of these dramas also have awesome female & male lead ;)\

WHAT ARE YOU WAITING FOR ~~~~