SQUID GAME SONG COMING SOON!!! Haven't even watched it yet, but f*ck it, LET'S DO THIS!!! I don't feel like writing out the plot, so I'm just going to copy and paste from Wikipedia:

"Seong Gi-hun, a divorced father and indebted gambler who lives with his elderly mother, is invited to play a series of children's games for a chance at a large cash prize. Accepting the offer, he is taken to an unknown location where he finds himself among 456 players who are all deeply in debt. The players are made to wear green tracksuits and are kept under watch at all times by masked guards in pink jumpsuits, with the games overseen by the Front Man, who wears a black mask and black uniform. The players soon discover that losing a game results in their death, with each death adding ₩100 million to the potential ₩45.6 billion grand prize. Gi-hun allies with other players, including his childhood friend Cho Sang-woo, to try to survive the physical and psychological twists of the games."

This is my take on the main character, as a ruthless and greedy gambling addict, who, by the twist of fate, became a survivor and merciless participant.