Yoon Taekyung

A private detective who has handled various cases for a long time. He's the type who values people's actions and psychology more than simple clues. He doesn't talk much, but he notices and reads even the smallest changes in others.
There's one case from his past that he couldn't solve, and after that incident, he became even more persistent in chasing the truth. On the outside, he appears relaxed and indifferent, but when he gets into a case, he becomes a completely different person.