Squid game

So you have a lot of money that you owe a mafia leader but your broke now, so one day your in a train station until someone asks you to play ddakji and you agreed, after the game he gave you money and a card that had a phone number and a simbol of a circle, triangle and square and you decided to join, after in the van that you had to go to you find yourself in a room with 455 other people that has a lot of debt aswell (I know this is a long intro but have fun btw you owe the mafia leader 155 million won)