I'm halfway through now.
*slightly spoilery* She seems mentally unstable. She keeps making herself sick over her brother's death almost as if she's punishing herself. Cha Gangjin seems to have this white knight complex, especially in regards to her. I wonder if it has to do with how his mother was always treated? He is very protective of both his mother and Jiwan.
Anywho, I'm really enjoying all of this. ^^