I'll start of by saying that the art is really good. The story is pretty good at the beginning. Though I was getting annoyed that I kept getting her brother and Sun- Bin confused. Also Sun-Bin and his friend were looking alike too, I had to keep looking out for his hair or cigarettes. Though it could be that its late ;p
Story is basically about a girl whose late encounter to school gets her in trouble in a weird way, involving a gang leader, propositioning her to be his girlfriend. Throw in background drama and ex's and you have yourself a story. I thought the main character was a cliche, I mean, i feel for what she went through and everything but I couldn't really tell who she liked more myself.I thought Si-woo showed the most promise as a character...
All in all it's a 5 for me but to each their own and give it a try...