It’s the 19th year of King Jeongjo’s reign. Kim Min, Joseon’s best detective, was once a special emissary carrying out secret missions for the king. Now, however, he has fallen out of favor and exiled to a remote island. The only people to visit him in his exile are his former partner Han Seo-pil, and a younger girl who calls on him every day asking him to find her sibling. As the quiet days go by, he hears the news that silver bullions of questionable quality are being circulated throughout Joseon, jolting awake his detective’s instincts.In a risky move, he leaves the place of his exile to get to the bottom of the silver bullions, and to find the girl’s sibling. For the first time ever, Joseon’s leading detective Kim Min and Seo-pil are taking on two cases simultaneously! However, the formidable duo finds themselves being led further into mystery by the beautiful Hisako.Can they solve the mysteries and reclaim their past glory?