The actor who plays the Front Man is named in episode 6
In episode 6, Sae-byeok and Ji-yeong talk about their pasts and futures while watching a film. When Ji-yeong says a line from a famous Korean movie, Inside Men, and specifies actor Lee Byung-hun, she references an inside joke that has been taking the internet by storm in recent weeks.
Cut to two episodes later, when the masked Front Man finally removes his mask, and whose face do we see? That’s Lee Byung-hun himself. Squid Game also had a sense of humor!