I am even later than you, I just finished watching this, and I absolutely love it. I'm not a fan of Korean dramas, but this was pretty entertaining. I agree wholeheartedly with you, I loved Yi Jung and Ga Eul's relationship better. I mean, it's the same concept as Jun Pyo and Jan Di, good girl changes bad boy...but I like the supporting couple better.
Kim Bum does have a killer smile with that cute dimple of his. The only thing that bothered me was how Yi Jung would always let Ga Eul walk away from him after she pours her heart out to him. She knew him more than he knew himself, and I loved how she would never leave him. He was so mean sometimes, but with looks like that, I wouldn't leave him either. I just wish they spent more time together, they were too freaking adorable. That scene where she runs into his place all exhausted, I really wanted her to pass out, so I could see him take care of her. I wanted a better ending for them, I felt Jun Pyo and Jan Di had too much drama.
Btw, is the Chinese version Hana Kimi?