A modern forensic scientist, Cho Kyung, finds herself transported back to ancient times. With the help of the renowned lame coroner, Master Jang, from Cheongsuhyeon, Cho Kyung adapts to her new life disguised as a male coroner. One day, while performing an autopsy for the wealthy Jo family to support her household, Cho Kyung receives devastating news: Master Jang has passed away under mysterious circumstances. Suspecting foul play, Cho Kyung begins uncovering secrets to avenge her mentor's death. During her investigation, a mysterious man named Lee Cheonso appears. He offers to help her seek revenge in exchange for her assistance with his own agenda...