A series of mysterious murders plagues 18th century Joseon. Reigning King Jeongjo who suspects that the murders are meant to conceal money laundering activities by high-ranking government officials, commissions the nation's top detective (Kim Myung Min) to investigate.
On the first day of the secret mission, the detective survives an assassination attack with the help of quick-witted dog seller Seo Pil (Oh Dal Su), who eventually becomes his partner. Armed with the only clue to the mystery, the alpine monkshood, they head off to Juksung where they meet Han Gaek Ju (Ha Ji Min), an influential business woman who is a central figure in the case.
As the duo delves into the mystery with the aid of Han Gaek Ju, they discover a massive conspiracy that will shake the whole nation of Joseon...
Translation credits: ljubov