Han Yi Joo is a painter. She was adopted by Han Jin Woong and Lee Jung Hye . Her father runs Hanwool Financial Group. Yet, Han Yi Joo was not loved by her parents or her younger sister Han Yoo Ra. She was always isolated from her family. Now, Han Yi Joo is married to Jung Se Hyeok. She learns that her husband Jung Se Hyeok loves her sister Han Yoo Ra and not her. On that same day, Han Yi Joo gets into 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 approaches Seo Do Guk, whom her younger sister Han Yoo Ra wants to marry. Seo Do Guk is the grandson of the Taeja Group’s founder. He is a smart and handsome young man. Han Yi Joo wants to enter into a contract marriage with Seo Do Guk and he willingly accepts, but he wants the contract marriage to become a real marriage.(Source: AsianWiki)Adapted from the webtoon “The Essence of a Perfect Marriage” (완벽한 결혼의 정석) written by Young (영) and Lee Beom Bae (이범배), and illustrated by Je Ri Bol (제리볼).