Player 017 Do Chung Soo

Player 017 is a quiet, unnoticeable, yet incredibly valuable participant in the Squid Game. He worked in a glass factory for over 30 years, giving him perfectly trained eyes and hearing. He is the only one who can distinguish between ordinary, fragile glass and durable tempered glass by the subtle reflections of light and sound. He remained in the shadows for a long time, but at the Glass Bridge stage, he emerged as a key figure, determining the lives of all remaining players. Calm and focused, he is highly vulnerable to the cruelty of others.