Yi Na has been charged with the murder of her beloved uncle. Ten years later, she is working as a profiler alongside the detective—and her accuser—Han Saem to unearth the truth about the murder. When the outstanding Juge Qi Tao of the Criminal Investigation Division has to team up with the Second Execution Division Chief Chu Yun, two worlds collide. Indeed, both have their own ways of working, causing difficulties to successfully handle the court cases.