Gong Ji-cheol, known professionally as Gong Yoo (공유), is a South Korean actor. He is known for his starring roles in the television series Coffee Prince (2007), Guardian: The Lonely and Great God (2016–2017), the Netflix series Squid Game (2021–2025), and the films Silenced (2011), The Suspect (2013), Train to Busan (2016), and The Age of Shadows (2016).