Detective Cha Jae Hwan (Park Hae Soo) investigates a new explosion reminiscent of the notorious Chimera Case from 1984, which claimed numerous lives. Partnering with former FBI agent Yoo Jin (Kim Soo Hyun) and skilled surgeon Lee Joong Yeob (Lee Hee Joon), they work tirelessly to track down the serial killer who has resurfaced after decades of silence. As they delve deeper into the investigation, the Chimera Killer continues to taunt them, pushing the team to their psychological limits and revealing increasingly horrifying details about the case. The trio must race against time to prevent further attacks and uncover the truth behind the killer's twisted agenda. This is a 2021 South Korean thriller crime drama directed by Kim Do Hoon.