Charles Chu
Joon
Ryan O'Nan
Butch Blossom
Caitlin Stasey
Cherry Swade
Alan Cumming
Uncle
Richard Kind
Fred
Melanie Lynskey
Miss Shoemaker
Christopher Marquette
Buddy
Annie Potts
Aunt
Mercedes Ruehl
Mrs. Fefterg
Dan Bakkedahl
Principal Cochette
Grant Shaud
Tim
Philip Ettinger
Donnie
Mary Rachel Quinn
Deborah
Lance Tafelski
Wolf
Steve Heinz
Security Guard
Peter Jae
Joon's older brother