In 1999, a small, rural town is shaken by a bizarre series of murders and a mysterious videotape. Detective Choi Hyung-in, still grieving his wife's death in a past terrorist attack, takes the case. His investigation leads him to Jo Jung-hyun, a woman ostracized because her brother, Jo Kyung-ho, was the terrorist responsible for the 1989 attack. When Jung-hyun's niece suddenly vanishes, she must join forces with the detective to uncover the truth. They soon discover that the current crimes are deeply connected to the past tragedy, revealing a sinister conspiracy involving a manipulative cult and unsettling psychological experiments. This gripping mystery thriller will keep you guessing until the very end. The show has ended, but sign up for a reminder just in case it returns.