All her life Jin Ji Ni has been running for her life as the annonymous and seemingly omnipresent Melchidech tracks her down. When she decides that she needs to attack rather than run away, she seeks the help of Private Investigator Ji Woo, a man who will solve any case as long as he recieves the right sum of money. Ji Woo has been framed for the murder of his best friend Kevin and as the search for Melchidech sends Ji Ni and Ji Woo across Asia, the Korean Police officers Do Soo and Yoon So Ran follow. Knowing that Ji Woo will use Ji Ni as bait in order to find Melchidech, her boyfriend Kai also follows, demanding that Ji Ni stays with him. However, when Ji Ni learns more about the reason for being wanted by Melchidech, she intends to stay alongside Ji Woo and unravel the mystery together.