There are a LOT of extras in Bastard that appear in the story. Fortunately, there are a diverse range of age types and personalities from bystandards, to children, to older fellows. You will even have to reprise an extra role because these characters do come back. However, whether it be a victim of Dongsoo's murdering spree or one of Jin's bullies, your role is as important to the story as much as the main cast.