Brief Story Line
Jeong-yoon (Park Ju-hyun - Drive, Zombie Detective TV series etc) was a young woman who had been living by herself and working hard to make ends meet. She did not have a lot of friends but one of them was a police Detective Park Ki-hoon (Kwak Si-yang - The Desperate Chase. Cafe Minamdang TV series etc).
When Jeong-yoon was crossing the street, she passed by a mysterious man later on revealed to be Jun-woo (Jeong Jae-hyun - Dear M TV series etc) who warned her that she would die in 6 hours. Despite her skepticisim, Jeong-yoon decided to find out if there was any truth to it.