In 1930s Korea, during the Japanese occupation, a young woman named Sook-hee is recruited to take part in a bold plan that will change her life forever. The story begins with a conman named Count Fujiwara, who is determined to seduce a wealthy Japanese heiress living in a mansion with her aunt in order to steal her fortune. To execute his plan, he hires Sook-hee as a maid. The idea is for Sook-hee to help the Count infiltrate the heiress's world and make her believe he is a nobleman.