This show is simply superb. The story is incredible, the characters' development is compelling and the acting is amazing. I feel as if each character resembled someone I could see in real life. Bae Sung-Woo's character's development from a harsh and unsympathetic police officer who doesn't show care for his loved ones to someone who shows up for his wife and understands the pressure on his fellow officers was one of the best parts of this show. I loved the focus on An Jang-Mi's character, an older woman in the police force and her struggles to reconcile with the nature of her job and the corruption of the force. My only gripe with this show is that they don't develop Hye-ri as much as they could have, and that the show at times errs on uncritical support of the police. However, these pale in comparison to the story and the characters in the show, it is a must-watch.