I liked the lead actress and the past tense detective unfortunately that was not enough to keep me watching. I do not like flashbacks and nonlinear timelines in general but I could have overlooked that had the overall delivery been good but it really was not the case. The build up to the climax is great then it falls flat. It's seems like a pattern that many action/crime/thriller Korean dramas follow. It's really a shame because they have potential.
The acting bit is where it really did not disappoint. All the featured actors where anywhere from descent (the one that kidnapped the child) to great. I really did like the main actress a lot. The "female law enforcement character" is often a good one in Korean dramas that I must applaud.