W (Korean: 더블유; RR: Deo-beul-yoo) 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.