In 1984, a potential serial killer struck again as a ghastly explosion shook the city. Now it’s 2019, and copies of those crimes come to light. Follow the team of Detective Jae Hwan, Profiler Yoo Jin, and Surgeon Dr. Joong Yeob assigned to solve both the cold and current cases. Their prime suspect goes by ‘Chimera’, after the beast in Greek mythology. It had the head of a lion, the body of a goat, and the tail of a fire-breathing serpent. To capture the criminal, they must first uncover the secrets that link the two cases some thirty-five years apart. Could the clue lie in the tale of the mythical monster?