A successful psychology professor and renowned author, Soohyun enjoys a perfect life, but when she loses her son unjustly, she takes matters into her own hands by confronting the perpetrator. Suffering from a loss of zest for life, Soohyun is comforted by a fellow inmate she meets in prison and slowly begins to open her heart. Upon her release, Soohyun searches for the victim of the accident caused by her fellow inmate and meets Seonyul, who shares the same pain as her. As the two individuals harboring secrets face each other, they embark on an intense journey toward the truth, exchanging solace along the way.
