"SKY Castle" follows the lives of 4 women living in swanky SKY Castle whose try make their husbands more successful and raise their children like prince and princesses. Han Seo Jin (Yum Jung Ah) is married to orthopedic surgeon Kang Joon Sang (Jung Joon Ho). They have two daughters. Han Seo Jin's life seem perfect but she has secret. Lee Soo Im (Lee Tae Ran) is children's books writer. She holds a deep affection and consideration for people. Lee Soo Im is married to neurosurgeon Hwang Chi Young (Choi Won-Young). No Seung Hye (Yoon Se Ah) is married to law school professor Cha Min Hyuk (Kim Byung Chul). Her husband always talks about justice and happiness to hides a different side. One with having extreme egoism. They have two sons. Jin Jin Hee (Oh Na Ra) comes from a wealthy family. Jin Jin Hee admires Han Seo Jin and tries to copy what she does. Like Han Seo Jin, Jin Jin Hee also is married to an orthopedic surgeon, Woo Yang Woo (Jo Jae Yun).