Already a popular influencer and the CEO of an interior design company, Park Kyung-Hee (Kim Hye-Soo), is thirsty for even greater success. She is married to actor Lim Jae-Hong (Kim Ji-Hoon), but he lives in the shadow of his successful wife Park Kyung-Hee. Their neighbor is Ahn Soo-Jung (Cho Yeo-Jeong), who is a dermatologist. Ahn Soo-Jung is involved in a messy divorce with her ex-husband Joo Bo-Sung (Kim Jae-Chul) as they fight over the custody of their daughter. Su-Jeong tries to protect her daughter no matter what. Meanwhile, Joo Bo-Sung tries to regain custody of his daughter by any means. These two couple’s lives become intertwined by an uncontrollable secret that makes even adultery seem insignificant. A series of chaotic collisions ensues.