Height 187 cm Do-Chan is one of the ten pillars of Castle, the world's most well-known assassin and their symbol of strength, with his might being called upon to deal with any problems that require a forceful approach to them, and with him, he carries a detail that consists of most of Castle's strongest enforcers and members. His life and operations are closely tied to most of the cast's own, being, for example, the murderer of Kang Min-Seok and one of Shin's main motivators for revenge.