Kim Kyu-baek

as Informant X

as Lee Go-dong

as Yeo-back

as Kim Yi-byung

as North Korean Agent

as Drunk 1

as Independence Soldier

as Army Personnel

as Peddler

as Volleyball Prisoner

as Joseon Draftee

as Young-choon's Gang Member

as [Seongju Prison inmate #1369]

as Joo Myeong-hun

as [Yu Na's brother]

as Jong-gil's Son

as Kim Hyung Bok