The Huayang Gang (S01E02)

After discovering a video revealing his covert operation, Han Ji Hyuk embarks on a mission to uncover the mole within the agency and complete his investigation. As he identifies potential suspects, Jang Gwang Cheol, the Huayang Gang's second-in-command, is apprehended. Following his arrest, the police receive a chilling ultimatum: release him immediately or face dire repercussions.