K-drama rich bad boy + Modest wise girl ? - just a bit Falling for innoncence

Hey Guys ! 

I need help ! I really loved Falling for innocence.. But only the 1st episodes.. Everything WAS perfect until they mess up.. [[Spoil for people who haven't watch it yet]]  The guy just get a heart surgery, why did he changed the personality ? It was skdnusjbfuib. It was too much. Then I dropped it. But I still think about how good it was..  

So I'm looking for a K-drama with a Bad Man (boy, its okay too) with a wise girl, not the cheesy, naive girl who doesn't have a mouth !.. Just like the 1st episode of Falling for innocence ! ^^""""""

I need help please ! I'm on my Romance Drama period ;w; If it's a movie, its okay ! 

New Tales of a Gisaeng (Korea)- Rich self-centered heir who falls for the elegant and gentle girl with a poor background.  This one is pretty long (52 episodes) but story wise this one is a personal fave

Monstar (Korea) - cold and popular idol who is forced to attend school daily to re-invent his image after a recent scandal, there he meets a weird no-nonsense girl who just transferred from the mountains of alps, who doesn't really care who he is and what he is about. though this one is high school setting, so he is a bad high school boy 

Autumn Concerto (Taiwan) - ML is the reckless bad boy son of the university director who makes a bet in regards to the FL who is poor bento maker in school. She maybe weak in terms of not really speaking out on how poor and hard her life is, but she has a quite strength when she stands up

Neung Nai Suang (Thailand)- ML is a rich and spoiled heir who every woman swoons for, who just arrived from his study abroad. FL is a homebody and humble girl who swore in her life never to meet the boy who teased her endlessly as kids who happens to be the ML.