Nisa is the embodiment of perfection in the stuffy London art world, until she discovers that her husband, Thomsen, has a double life with a young artist in Seoul named Min-hee. Instead of attacking, Nisa chose infiltration. He flies to Korea, disguises himself as a mysterious collector named Sarah, and enters Min-hee's life. However, the line between revenge and obsession blurs when Nisa begins to have an affair with the woman who is her husband's affair. A game of cat and mouse that ends on one grand exhibition stage where everyone's masks are destroyed in front of the public.