완득이

유아인

Do Wan-deuk

김윤석

Lee Dong-joo

박수영

Wan-deuk's Father

Lee Jasmine

Wan-deuk's Mother

김영재

Nam Min-gu

안길강

Coach

박효주

Lee Ho-jeong

강별

Jeong Yun-ha

김동영

Hyeok-Ju

조덕제

Director of Students

성유빈

Young Wan-deuk

김상호

Annoyed Neighbor

Sudip Banerjee

Hassan

조상건

Dong-joo's Father

김종만

Waiter

윤경호

Market Man

김윤태

Police