Im Si-wan (Korean: 임시완; born Im Woong-jae) is a South Korean actor and singer. He is a member of the South Korean boy band ZE:A and its sub-group ZE:A Five. As an actor, he is best known for starring in the film The Attorney (2013), and the television series Misaeng: Incomplete Life (2014), which were both successful at the box office and in the ratings. He gained international recognition for his role in the second and third seasons of Squid Game (2024–2025).