Jung jihee is an ordinary detective, who helps the innocent and punishes the wrong. On the other hand, there is a forensic pathologist named Kang wonhae, who often helps jihee with her cases, normally by doing autopsies. One day, wonhae gets framed for a huge businessman's murder, and eventually gets arrested. Now jihee tries her best to prove wonhae's innocence and catch the real culprit. "Who are you?"