Korean Drama like That Winter The Wind Blows?

Hi everybody!!

I am a big fan of korean drama That Winter The wind blows. It is my first melodrama and I really liked it!!

I would really like to see a similar one with the following characteristics:

-Bad guy turned good due to facing a girl he never faced before(I really liked the fact she was blind!)

-Main leads with sad backround stories

-An intriguing and breathtaking plot

I have checked out almost every Korean Drama but I've seen 2/3 of them. 

For reference I have seen Can you hear my heart, innocent man and hotel king(I am half way there...) which may be similar in a way....

I am waiting your answers! Thanks for your time :D

I agree with @MinaVIP about Shark

Two Weeks

Falling for Innocence: it's a romcom, not a melo like THTWB, but it also has the bad-to-good male lead and sad background story reqs.