Police lieutenant Jeon Jungkook investigates the case of a mysterious criminal, who attacked his boyfriend Kim Taehyung with a knife. In the fight the criminal is killed by his own weapon. During the incident, Taehyung, though a cardiologist himself, suffered from a heart attack and fell unconscious. The ambulance took him to the hospital. While he is in coma, his lover lieutenant Jeon tries to cope with shock and distress.