Nam Han Joon is a former criminal profiler now working as a conman. To run his scams, he disguises himself as a fortune teller with his shop called Minamdang. Clients are drawn to his attractive appearance and smooth-talking manner. While he cheats his customers out money, he works to solve their issues, all the while providing excellent customer service. He's partnered up with Gong Soo Cheol, who runs a private detective agency, and his younger sister, Hye Joon, an elite hacker. For the last three years, Detective Han Jae Hee performed her job with enthusiasm and integrity. Will her involvement with Nam Han Joon jeopardize all of that?