Ji Seon-u (Kim Hee-ae), a revered family medicine doctor and associate director at Family Love Hospital in Gosan, South Korea, believes she has a perfect life with her aspiring director husband Lee Tae-oh (Park Hae-joon) and their son Lee Jun-yeong (Jeon Jin-seo). However, her world shatters when she discovers Tae-oh's affair with the young and attractive Yeo Da-kyung (Han So-hee). Shocked and betrayed, Seon-u decides to divorce and meticulously plans her revenge. After the divorce, Seon-u identifies Tae-oh's financial status and puts him on the verge of bankruptcy, revealing his affair to Da-kyung's parents. Tae-oh and Da-kyung eventually get married, but Tae-oh's dishonest behavior and lies destabilize their relationship. Seon-u tries to reorganize her life and restore her relationship with her son, Jun-yeong. However, Tae-oh is still obsessed with Seon-u and tries to ruin her life. Eventually, Tae-oh ends up in a catastrophe and also breaks up with Da-kyung.