Ji Hoon, who is the leader of Special Affairs Team TEN, has suddenly disappeared. The other members of Team TEN, Do Shik, Ye Ri and Min Ho are confused by the situation, but they soon find a message which explains Ji Hoon's intentions. The members of TEN team chase after the traces of a serial killer known as "murderer F". As they get closer to murderer F, they are in for an unexpected shock.