The two previously worked together in drama 'Doctors', produced by Oh Choong Hwan PD who will be working on 'While You Were Sleeping' as his next production. 

'While You Were Sleeping', starring Lee Jong Suk and Suzy, tells the story of a woman who can see crimes occurring in the future in her dreams, and an investigator who works with her to prevent those crimes. It's set to air in September.