"W" is a fantasy romance TV series that tells the story of men and women in their early 30s. In the real world, Oh Yeon-joo (Han Hyo-joo), a surgeon, hears about the disappearance of her father, a famous cartoonist, so she rushes to her father's studio to look for clues and accidentally enters the world of the popular comic "W". In Seoul in 2016, in the same space but different dimensions, it is a suspenseful romantic love story that unfolds in reality and fantasy with the comic's male protagonist Kang Cheol (Lee Jong-suk).