After a tragic accident, 18-year-old Yoon Taemin finds himself inhabiting the body of the timid and mistreated Min Siwoon, a wealthy teenager with a dark past. Concealing his true identity by pretending memory loss, Taemin navigates this unfamiliar existence where even those closest to Siwoon harbor deep animosity. When Taemin reunites with his childhood friend, Han Siwon, their complex history resurfaces, unveiling long-buried secrets and strained relationships.