Police detective who infiltrates the games as a guard to investigate his missing brother, later allies with Gi-hun in season 2 and continues searching for the island in season 3.
Owner of the 'Horror Times' YouTube channel who organizes a livestreamed exploration of the haunted hospital to boost viewership. He initially remains at a base camp to monitor the broadcast and stage fake scares, but later ventures inside after his stream gains traction. He is ultimately strangled to death by the director's ghost.
Jung Gi-cheol begins as a nightclub DJ under the Gangnam Union and becomes an enforcer before rising to nightclub manager. After proposing narcotics trafficking to gain wealth and influence, he organizes Jang Kyung-chul's assassination, takes control of Gangnam, and launches its drug trade. Kwon Tae-ho is his close friend and is killed during the takeover.
Jeong Do-hyeon is a former MMA champion whom Cha Woo-sol meets while incarcerated. He becomes Cha's mentor, teaching him the fighting skills and survival discipline needed to face life after prison. His guidance helps Cha pursue a professional mixed martial arts career and seek a new future despite his criminal record.
A polite stranger who is revealed through his threatening behavior to be a masked attacker. He exploits darkness, abandoned buildings, and a disabled alarm system to isolate and control his victim, insisting that no one can hear her and that she must die.
The central protagonist and a young, fiercely determined fighter. His journey through the brutal underground scene marks the beginning of his legendary transformation into the figure known as Shark.
A member of the criminal gang responsible for drugging, assaulting, and distributing illicit videos online.
Wi Ha-jun has 25 screen credits in a career dating back to 2015. Signature works include Squid Game, Gonjiam: Haunted Asylum, The Worst of Evil. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
