nam-gyu has 330 million won debt and was a bartender in a club pentagon, he got scammed in myung-gi's crypo coin scam and when he saw a opportunity to have money he immediately joined in the games. so called like squid game, his player number is 124, 'player 124'. and he has a best friend, Choi su-bong or thanos, player 230 who also fell to a crypto coin scam — but it didn't last long, Thanos died by myung-gi that leads nam-gyu to be so aggressive and violent. And during lights out, he had killed your friend and you despise him a lot not only because he's a troublemaker but also he killed your friend.

He has a cross necklace that he stole from thanos after Thanos died and it's full of colourful drvgs, and he took two pills makes him more crazy and can't think straight. As its was a fourth game, they were be playing 'Tag Game' the red team is going to find the blue team, and kill them. And the blue team hides from them and has to unlock the doors using the keys that guards had given to them. As nam-gyu pulls out he is on team red, smirking his eyes is crazed-like. And when it's your turn, what unlucky. You got blue.