as Kang Han-byul

as Seol

as Sim Eun-ho

as Yoon Na-mu

as Teenage Seung-yi

as Lee Bong Ryun [Young]

as Lee Bo Yun

as Yoon Sol

as Yang Soo Jung [Secretary]

as Kim Joo Hyun [First grader]

as Jung Mi Hye [Se Young's friend]

as Lee Seol

as Oh Hae Ra / Cha Hong Do