Squid Game: What does 456 player's red hair color mean at the end of the series?

If you've already finished the "Squid Game" series, you may not have noticed the latest action of Gi-hun, player 456. He dyes his hair an unusual and bright red color.

Why?

At the beginning of the competition, Gi-hun and the other players face the fatal game "Red Light, Green Light", in which his loss seems very close, but he manages to do it.

Gi-hun is the only one who manages to get out of the game alive and then, even from the ongoing games. After a shocking encounter with Oh Il-nam, the man behind the games, Gi-hun is able to fully process his grief and keeps his promise to help Song Sae-byeok's younger brother and Cho Sang-Woo's mother, being given them half the prize money.

It is at this time that Gi-hun does the hair transformation, which according to director Hwang Dong-hyuk is a reflection of his inner anger.

"I thought about it intuitively, thinking about how Gi-hun should change his hair in a hair salon. I imagined I was him and I thought to myself 'What is the color I would never choose for my hair?' Then I came to the conclusion that Gi-hun would never dye his hair red. "It would be the most unexpected thing he could do."

For Gi-hun, the movement serves as a powerful symbol of the anger that burns within him after he was subjected to such brutal torture.

Another explanation relates to the fact that at the end of the series, the 456 does not continue the journey it had booked, but goes back. In this case, "red light", that is, the hair, means his inability to move forward after everything he has experienced.

Source: Pop Sugar