What was number 1 behind Squid Games?

What was number 1 behind Squid Games? In the season finale for “Squid Game,” we learn that Player 001, the man who befriended main protagonist and eventual winner Seong Gi-hun (Lee Jung-jae), was the one who set up the entire game, the grandmaster behind all of this mayhem.

In the season finale for “Squid Game,” we learn that Player 001, the man who befriended main protagonist and eventual winner Seong Gi-hun (Lee Jung-jae), was the one who set up the entire game, the grandmaster behind all of this mayhem.
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