Young-hee (영희 Yeong-hui?), also known as The Doll, is a large motion-sensing animatronic doll that has been used in the Squid Games, including the 33rd Squid Game in 2020 and the 36th Squid Game in 2023, during "Red Light, Green Light" and has also featured in the background during the titular "Squid Game". Her eyes are able to scan the movement of players quickly to see if any of the players are moving after hearing "red light," all players who did so are eliminated, along with any players who don't make it to the end in time.

Based on the Korean textbook character of the same name, Young-hee resembles a young girl with black hair in low short pigtails with faded purple beads and a barrette in her hair that resembles the Squid Game symbol that is the same color as her beads. A yellow collared T-shirt, orange pinafore, knee high white socks and black shoes. She has black eyes which the pupils turn red when detecting a player moving on red light. During the "Red Light, Green Light" game, she repeatedly says (무궁화꽃이 피았습니다 Mugunghwa-kkochi pieot-seumnida?, which roughly translates to "The Mugungha Flower has bloomed") – referring to the hibiscus syriacus, the national flower of South Korea.

During her role in the 33rd Squid Game, 255 players were eliminated, which was mainly due to the mass panic following the deaths of two players. She is the girlfriend of fellow large motion-sensing animatronic doll Cheol-su. A near identical version of Young-hee was featured in the reality spin-off series Squid Game: The Challenge. Young-hee was used once again in the Squid Game in 2024, specifically during Red Light, Green Light.

33rd Squid Game

Red Light, Green Light

Young-hee was positioned at one end of the field, the other players were given the task of getting to her side of the field within a set time limit, but they can only move when Young-hee's back was turned. If any players were caught moving when she turns around, they were eliminated from the game and shot dead by unseen snipers.