20th Century Girl

Kim Yoo-jung

Na Bo-ra

Byeon Woo-seok

Poong Woon-ho

Park Jung-woo

Baek Hyun-jin

Roh Yoon-seo

Kim Yeon-du

Kim Sung-kyung

Bo-ra's Mother

Jeong Seok-yong

Bo-ra's Father

Yoon Yi-reh

Madam

Jeon Hye-won

Darn It

Kim Nu-rim

Dong-wook

Han Hyo-joo

Adult Na Bo-ra

Lee Beom-soo

School Teacher

Ryu Seung-ryong

Poong Woon-ho's Father

Park Hae-joon

Doctor at School Infirmary

Gong Myoung

Jung Woon-ho

Ong Seong-wu

Joseph / Poong Joon-ho

Kang Chae-young

Bok-soon

Bang Woo-ri

Yeon-du's Mother

Lee Cheon-mu

Bo-ra's Brother

Jo Ji-hyeon

Teacher

Lee Woo-sung

Min Hong-gi