Seoul, 2020. Korea has seen the unification of the North and South divide and now the threat of human genome genetics is causing much concern as scientists involved in these experiments are being killed off one by one. Hardened cop, Suk (Kim Seung-woo) and his partner May (Kim Seon-ah) along with their crack team are sent to investigate the murders. When her father is abducted by a terrorist, police profiler Hee-su (Kim Yun-jin) joins the team. They discover that a man going by the name of Goliath (Choi Min-su) is behind the deaths but his motivations are unclear as he requests no demands. As the hunt continues, Suk and Hee-su learn more about each other and their past which somehow is connected to all of this.