Yang Shi On and her boyfriend Lee Hyung Joon are involved in an accident. 6 years later, Shi On is a detective with no recollection of what happened that night. She meets Chag Gun Woo, a fellow detective who only believes in physical things. He is very against believing things that you cannot see.
Meeting Shi On changes his life. She can see things no one else can like ghosts and spirits, having gained the ability as a result of the accident. Furthermore, Hyung Joon now watches over her……as a ghost!
The three of them form a love triangle while trying to solve cases requiring supernatural abilities.
Cha Gun Woo (Ok Taecyeon)
Yang Shi On (So Yi Hyun)
Kim Jae Wook (Lee Hyung Joon)