Jinyoung
Lee Ahn

Shin Ye-eun
Yoon Jae In

Kim Kwon
Kang Sung Mo

Kim Da-som
Eun Ji Soo

Cho Byeong-kyu
Kang Sung Mo (young)

Jeon Mi-seon
Kang Eun-ju

Go Youn-jung
Kim So-hyun

Ro Jong-hyun
Lee Dae-bong

Jeong Seok-yong
Yoon Tae-ha

Jang Eui-soo
Lee Seung-yong

Lee Seung-joon
Kang Geun-taek

Sa Kang
Hong Soo-yeon

Kim Hyo-jin
Oh Sook-ja

Kim Ki-moo
Hong Jeong-soo

Uhm Hyo-seop
Eun Byeong-ho

Kim Won-hae
Math Teacher

Park Cheol-min
Nam Dae-nam

Choo Ye-jin
Eun Ji Su [Teen]

Kim Sung Jun
Lee Dae Bong [Young]