Secret

When a brother of a notorious mob boss is found brutally murdered, Detective Kim Seong-yeol gets tasked with seeking the truth. As he investigates the crime scene, he realizes all evidence leads toward his own wife. Going behind his partner and rival, Detective Choi, Kim decides to cover up the evidence and has the only eyewitness go into hiding. As his investigation progresses, more evidence emerges pointing toward his wife as the murderer. As Kim gets closer to the truth, the victim’s brother and mob boss, Jackal, emerges from the shadows, swearing vengeance on the killer.