Charles Chu as Joon

Ryan O'Nan as Butch Blossom

Caitlin Stasey as Cherry Swade

Alan Cumming as Uncle

Richard Kind as Fred

Melanie Lynskey as Miss Shoemaker

Christopher Rodriguez Marquette as Buddy

Annie Potts as Aunt

Mercedes Ruehl as Mrs. Fefterg

Dan Bakkedahl as Principal Cochette

Grant Shaud as Tim

Philip Ettinger as Donnie

Mary Rachel Quinn as Deborah

Lance Tafelski as Wolf

Steve Heinz as Security Guard

Peter Jae as Joon's older brother