In a poignant high school tale, Ji Soo harbors a secret crush on her best friend Sun Jae. Their bond is shattered when Sun Jae suffers an accident, resulting in memory loss that erases their shared history. Despite his amnesia, Ji Soo remains devoted, but her heart aches as he begins to form a new relationship with Sol, a girl who quickly captures Sun Jae's affections. Ji Soo struggles to hide her feelings, feeling increasingly sidelined as she witnesses their blossoming romance. Ultimately, overwhelmed by her heartache, she decides to distance herself from Sun Jae. As he moves on and marries Sol, Ji Soo reflects on their past, grappling with the painful memories of their once-close friendship and the love that could never be realized.