Seoa had been engaged in a clandestine romance with her best friend, Jisu. On a summer afternoon, while at Jisu’s home, their secret is unveiled by Jisu’s father. With her vulnerability exposed, Seoa submits to him and finds herself lost between feelings of guilt and a new form of pleasure—a steamy secret with her friend, along with a risky liaison with her friend’s father. Trembling with a mix of guilt and pleasure, Seoa starts to desire the thrill more and more. Awakened to an illicit longing, she ultimately makes the first move to contact him… Now caught in a web involving both her friend and her friend’s father simultaneously. Amid the constant anxiety of potentially being discovered, she becomes more and more addicted to the forbidden ecstasy and delves deeper into the quagmire of insatiable desire.