Guest Stars Oh Ji Yul as Ha Ye Sol Ahn So Yo as Kim Gyung Ran Yoon Da Kyung as Hong Young Ae Jung Ji So as Teen Dong Eun Kim Jung Young as Park Sang Im Shin Ye Eun as Teen Yun Jin Song Byung Geun as Teen Jae Joon Jun Soo Ah as Sung Han's School's Nurse Seo Woo Hyuk as Teen Myung Oh Kim Nam Jin as So Hee's Mother Heo Dong Won as Choo Jung Ho Song Ji Woo as Teen Hye Jung Jo Min Wook as Kim Jung Hun Lee So E as Yoon So Hee Yoon Sung Won as Teacher Kang Park Yoon Hee as Kim Jong Moon Kim Bi Bi as Nurse Kim Kang Gil Woo as Kim Soo Han Kim Kwon as Do Young's Chauffeur Park Sang Jong as Kim Shin Tae Lee Min Goo as Doctor Lee Eun Joo as Pharmacist