Guest Stars Jo In as Kang Bo Ri Jung Yi Seo as Woo Hyung Joo Kim Jong Tae as Hyung Joo's Stephfather So Joo Yun as Kim Jong Hee Lee Ga Yun as Young Jong Hee Park Yoon Young as Young Hyung Joo Jung Yoo Mi as Hyung Joo's Mother So Ah Rin as Young Bo Ri Choi Sol Hee as Homeroom Teacher