W (Korean: 더블유) is a 2016 South Korean television series, starring Lee Jong-suk and Han Hyo-joo. Consisting of 16 episodes, it aired on Wednesdays and Thursdays at 22:00 (KST) on MBC from July 20 to September 14, 2016. W centers on the clash between "two worlds": the real world and an alternate universe inside a webtoon, from which the title of the television series was taken.

Lee Jong-suk is a South Korean actor and model. He debuted in 2005 as a runway model, becoming the youngest male model ever to participate in Seoul Fashion Week. Lee's breakthrough role was in School 2013 (2012). He is also well known for his roles in I Can Hear Your Voice (2013), Doctor Stranger (2014), Pinocchio (2014), W (2016), While You Were Sleeping (2017), Romance Is a Bonus Book (2019), and Big Mouth (2022).