Doubt as a series is not a psychological drama, but an unnecessarily stretched-to-the-max attempt to a thriller. The profiler character is a police officer who sometimes paces away with -or utters- a clue (we will never know how he got to his conclusions, but he is a profiler so why question his methods). The daughter (who is a suspect) is someone who refuses to explain her actions to anyone. But is perma-angry that she is a suspect. The series pace is painfully slow, I fear that this is what some confuse with psychological. It completely ruined the story for me. I found myself skipping parts, skipping episodes and still very much able to follow the clue in the last part. So: poorly worked-out characters and motivations, super slow pace, nonsensical attitudes. The best actors to me are officer Gu Dae-Hong (played by Roh Jae-Won) and criminal Choi Young-Min (played by Kim Jung-Jin). I found the rest utterly forgettable.