완득이

유아인

Do Wan-deuk

Kim Yoon-seok

Lee Dong-joo

Park Soo-young

Wan-deuk's Father

Lee Jasmine

Wan-deuk's Mother

김영재

Nam Min-gu

Ahn Kil-kang

Coach

박효주

Lee Ho-jeong

강별

Jeong Yun-ha

김동영

Hyeok-Ju

Jo Deok-jae

Director of Students

성유빈

Young Wan-deuk

Kim Sang-ho

Annoyed Neighbor