A waiter, Hong Jun-ho, is murdered at a live bar in Gangnam. The four suspects present at the scene - Jeong-hyeok, Madam Han, Ho-jin, and Ji-young - give conflicting testimonies. Detective Cha Jun-seok, who is in charge of the case, summons Hae-ryeong, a ghost haunting Gangnam, using his ability to see spirits. Soon, a tense interrogation begins to identify the culprit.