Being More Mature Than Adults At The Age Of 18

Seong-wu Ong

Choi Jun Woo

Hyang-gi Kim

Yoo Soo-bin

Seung-Ho Shin

Ma Hwi-young

Kang Ki-young

Oh Han-kyeol

Kim Do-Wan

Jo Sang-hoon

Moon-Bin

Jung Oh Je

Kim Sun-young

Yoon Song-hee (Soo-bin's mother)

Yi-yeong Shim

Lee Yeon-woo

Park Sung-Geun

Lee Guan Yong [Vice Principal]

Yoo In-soo

Yoo Pil-sang

Jung Young-joo

Park Geum Ja

Young-ji Heo

Kim Ji Min

Sungmin Han

Hwang Ro-mi