Han Yi Joo is a painter. She was adopted by Han Jin Woong and Lee Jung Hye. Her father runs the Hanwool Financial Group. However, Han Yi Joo was not loved by either her parents or her younger sister, Han Yoo Ra. She has always been isolated from her family. Han Yi Joo is now married to Jung Se Hyeok. She discovers that her husband, Jung Se Hyeok, loves her sister, Han Yoo Ra, and not her. That very same day, Han Yi Joo is involved in a car accident and dies. When Han Yi Joo wakes up, she finds herself back in time, when she was engaged to Jung Se Hyeok. To change her fate and take revenge on her family, she breaks off her engagement to Jung Se Hyeok. She then gets close to Seo Do Guk, whom her younger sister Han Yoo Ra wants to marry. Seo Do Guk is the grandson of the founder of the Taeja Group. He is an intelligent and charming young man. Han Yi Joo wants to enter into a marriage contract with Seo Do Guk and he readily agrees, but he wants the marriage contract to become a real marriage.