Firefighter Ho Chul accidentally witnessed the crime scene of the Rich Girl Killer while on duty two years ago. He was the only witness to the murder and suffered from the trauma. In the end, he and his family moved into Parisville City, a more secure apartment. However, today in Parisville, a horrifying murder happens in the same way.
The person who kidnapped Soo A tells Ho Chul that he has 24 hours to find the serial killer and kill him. If he fails to kill him, he may see his daughter as a corpse. Panicked and worried, Ho Chul rushes to confront the ex-convict security guard he saw with Soo A to find out the identity of the mysterious man.