Unfortunately, this drama was a disappointment. I'm only giving it 2 out of 10 stars because : Kai was a delight. I wasn't expecting much from him, but he really pulled it off and his performance as a carefree student who eventually changes was really good. He should play the cute, happy, outgoing guy more often. Secondly, his sister's love story was interesting and I liked her character as well. So, these two things kept me going. However, the rest were a disaster. I can't express enough how bad the editing was. We had Kai in school thinking of Bom, then, suddenly, Kai in his room calling her and next Kai in the hospital meeting her. I mean, how can someone skip a whole day in a few minutes, even if it's a drama, and not make it look wierd ? In addition, the story was okay, not anything too original to keep you entertained for long, but there was a major twist in the end, at least. Finally, the girl who played Bom was not really good with her expressions, expecially in the first episodes. She did got a bit better, but, overall, she was bad. But, I'm cutting her some sluck because it was her first acting attempt. All in all, 2 out of 10.