456 marginalized people in South Korea who were swept out of society due to personal reasons such as crime, greed, decadence, and gambling were suddenly desperation and invited to participate in a survival game by a mysterious organization with huge bonuses as bait.The games involved are children's games from the 1970s to the 1980s, including “123 Wooden Man”, “Sugar Pie Picking”, “Tug of War”, “Playing Marbles”, “Walking on the Glass Bridge” and “Squid Game”.

But underneath the appearance of a childhood game, it is essentially a game of survival.The location of this survival game is unknown, and the participants will be locked in the game location-“Battle Royale” secret room until the final winner is born.

Although the ultimate prize is as high as 45.6 billion won, the cost of getting the prize and getting out of the secret room is the lives of the remaining 455 people.