CEO Jang's first son and heir to Jangga Group. Geun Won was Sae Ro Ri and Soo Ah's classmate in high school who frequently bullied their classmate Ho Jin. He caused the vehicular accident that killed Sae Ro Yi's father Sung Yeol. Years later when he attempts to recruit Yi Seo into Jangga, his confession to the crime is recorded by her and he attacks her until Sae Ro Ri intervenes and gets him arrested. Dae Hee deserts Geun Won by admitting his son's crimes during his apology meeting and getting him sent to prison. In 2020, he is released and alongside Kim Hee Hon and his gang, Geun Won plans to get revenge on Yi Seo.