Bluebeard (2017)

In the 2017 psychological thriller directed by Lee Soo Yeon, Cho Jin Woong stars as the lead. The film revolves around a hospital worker who's drawn into a murder case after hearing a confession from his patient.

Seung Hoon (Cho Jin Woong) is a doctor who once opened his own clinic in Seoul, but it didn't work out. This failure forces him to shut down his clinic and go back to working in a hospital.

During his work, Seung Hoon meets a patient who needs to be sedated for an examination. But before the sedation fully takes effect, the patient starts rambling and confesses to a series of murders.

Seung Hoon believes the confession and tries to alert the authorities. However, with no solid proof, he can't do much. He decides to investigate the case himself while the patient is still under anaesthesia.