In her first television drama, Kim Go Eun does an excellent job breathing life into her character. Along with Park Hae Jin, they play out their doomed relationship due to the male leads sociopathic tendencies. The audience is continually left wondering if the male protagonist's feelings are genuine. I think Park Hae Jin did a very good job delivering that ambiguity to his portrayal of his character. It's a very compelling story. I wasn't a big fan of the ending, but I've come to the realization that it was the only way the drama could have ended.