Eunha Lee is a smart, successful lawyer who has life figured out... that is, until she loses both her parents in a tragic accident and divorces her husband, Taeyang, a famous actor, who she discovers has been cheating on her. Things take a turn for the surreal after Eunha slips on a staircase only to wake up in her past. She is now 22 years old and back in law school. Determined to make better choices in this second life, Eunha swears off romance only to realize her male best friend, Sungwoo, has been in love with her this whole time!