I never watched the webtoon, so I have no idea how the drama relates to it. This review is solely based on watching the drama. It is a nice light psychological thriller. It isn't really suspenseful. There is no major action, no romance, no emotional revelations, no real character development. However, it is interesting if you like psychology which I do. The main story line is tied together neatly with the weekly "who done it" story line. I enjoyed it, but I kind of had it figured out about mid way through the drama. I have seen better psychological dramas. The acting is fine. Nothing stands out. I have seen Song Chang Eui do better. I am a huge fan of Sung Ji Ru and he excels as Detective Nam. The music is fine. I won't rewatch this. If you like psychological dramas, then there are better choices, but this one is ok.