as Teenage Seung-yi
as Kang Han-byul
as Seol
as Su-yeon
as Lee Seol
as Yoon Na-mu
as Jung Mi Hye [Se Young's friend]
as Jeong Da-hee
as Sim Eun-ho
as Lee Bong Ryun [Young]
as Lee Bo Yun
as Yoon Sol
as Yang Soo Jung [Secretary]
as Kim Joo Hyun [First grader]
