I LOVED this one. What I really liked doesn't rely on the investigations nor the plot twists (there were none) but on the characters' development and relationship. I fell in love with the main team, the other team of policemen. It was like a big family. I also enjoy the sub plot about how they have to face the criminals' ugly faces, how being a policeman or in this case the first profiler of Korea could be so difficult to handle mentally. The focus wasn't really on the case which was always resolved in 2/3 episodes and mostly easily but we paid attention to the after. What can we learn about those criminals ? Some conversations were awful to hear and the actors portrayed those reactions so brillantly that I was stunned before my screen. Highly recommended