Je-In (Ha Ji-Won) is a mystery novel writer. She chases after a serial killer with her longtime friend Rok-Hwan (Chun Jung-Myung). Rok-Hwan is a detective. A handsome and mysterious man, Jason (Chen Bolin), appears in front of them.
Filming began September 6, 2015 in Itaewon, Seoul, South Korea and finished December 5, 2015.