I've never seen j-drama but I've seen anime and I can tell that this version is good adaptation from anime/manga. If you aren't familiar with one of these two, you'll find this drama very weird :P
It reminds me of 'Cunning Single Lady' (also Joo Sang Wook plays character with similar personality as well <3). I already love it a lot! :D Can't wait for more episodes! ^^
At first it was great and I couldn't stop watching but soon it somehow started getting boring... The plot was good but it lacked something and I didn't really like Oh Young.
Great drama :) But probably I've missed something... What happened with his Lou Gehrig's disease? I've read that this disease lead to person's death so I was worried pretty much till the end but it wasn't mentioned :(