The drama will tell the story of a woman who can see crimes before they happen in her dreams, and an investigator who works with her to prevent those crimes. In addition to the male and female lead Lee Jong Suk and miss A's Suzy, the drama's casting includes Jung Hae In, Lee Sang Yup, Go Sung Hee, and more. 

You can tell in the photos below that despite the crime drama to come, the cast and staff were full of smiles during their 1st script reading. 'While You Sleep' is set to air after currently airing Wed-Thurs drama 'Into the New World', some time in September.