It's time for us to appear again! The 19th year of King Jeongjo. Kim Min, the best detective of Joseon, was exiled to an isolated island because he was not sure whether he received a secret order from the king at that time or because he was disliked by the king for some other reason. He was found by his former partner Seo Pil and a young girl who was looking for her brother who was with him every day. During this time, Kim Min learned that illegal silver was circulating in the battlefield of Joseon, so his dormant detective instinct was awakened. As a result, he escaped from the place of exile and launched a formal investigation into the illegal circulation of silver and the girl's missing brother. Kim Min and Seo Pil, the first Joseon detectives in history to solve two cases at the same time, but because of the beautiful woman Shouzi whose true identity was unknown, the investigation of this pair of famous partners became more and more chaotic. Can the two uncover these two suspicious cases and regain the glorious historical honor of the past? The best detective partners of Joseon, Kim Min and Seo Pil are back! "Joseon in crisis. Leave it to us to handle it"