The play tells the story of psychology professor Eun Soo-hyun (played by Kim Nam-joo) who originally had a beautiful life and successful career that everyone yearned for. However, after her young son was innocently killed, her life changed forever and she embarked on a path of tragic revenge.During this period, he meets Kwon Sun Yool (played by Cha Eun Woo), a dropout medical student. The two people, who have experienced similar misfortunes, try to uncover the truth of the incident and heal each other's pain.