Yoo Jae Yi (Hyeri) confronts her sister, Yoo Je Na, about their father's involvement in Woo Seul Ki's (Jung Soo Bin) father's death. Meanwhile, Seul Ki faces false accusations of drug distribution at Chaehwa High School, leading to a complex web of betrayal and alliances. Jae Yi strives to protect Seul Ki, even as their friendship teeters on the brink of obsession and rivalry.