This movie is 미녀는 괴로워 (means 'The Beauty is Nervous'). I saw it last week, and that was very fun.
There is one good singer, but she is fat and ugly. Everyday she is ignored, looke down on, even humilated by people.
After some serious events, she's got very heavy and dangerous plastic surgery and went on diet, changed from the fat and ugly into the beauty. She changed name, and acted as a whole new person.
So, she IS now beautiful, she know it only by head not by heart. So the story goes on.
The Leading actress, 김 아중(Kim, Ah-joong) acted very well. She played the both fat and slim one(thanks to special make-up and computer graphics), and sang herself. That was good comedy movie and I recommend with my heart.
If you want to get the knowledge about movie, try to visit here and there