In Gangnam, Seoul, Jae-Hee knows a secret about a series of disappearances but then vanishes herself. Detective Kang, outlaw Yoon, and Prosecutor Min pursue the truth for their own reasons.

A series of disappearances takes place in Gangnam, Seoul. Jae-Hee (Bibi) works for a famous bar in Gangnam and she knows a secret involving the series of disappearances, but she also disappears. People that become involved with the case include Detective Kang Dong-Woo (Jo Woo-Jin), who was demoted and then returned to work, Gangnam outlaw Yoon Gil-Ho (Ji Chang-Wook), who put himself on the list of suspects, and Prosecutor Min Seo-Jin (Ha Yoon-Kyung), who works on this case as an opportunity to raise his status. They chase after the truth of the case for different reasons.—Asian Wiki

A city where days bustling with people and nights staggering under the twinkling lights coexist. A series of disappearances occur in the middle of Gangnam. Jae Hui, an employee at an entertainment establishment who holds crucial evidence, suddenly disappears, and Yun Gil Ho, a problem solver in the entertainment district, begins to search for her. Gil Ho is not the only one looking for Jae Hui. Detective Kang Dong U, who was demoted after exposing his colleagues' wrongdoings, is assigned to the investigation at the chief's request, and prosecutor Min Seo Jin, who is favored by the chief prosecutor, is also following the case. As club officials use every means necessary to track down Jae Hui, a series of disappearances intertwined with various desires expose the dark face of Gangnam.—Naver