After her grandmother passed away, the kind, caring Tiffany was claimed by her father that she never met before. he is the head mafia of Seoul. As she lives with her father, she starts to understand what her father really is. She was targeted by the a government agency belonging to the Republic of Korea. Taecyeon was ordered to kill Tiffany, but he spares her life because he has feeling for her ever since he met her at a restaurant. Taecyeon helps her by hiding in his house and changed her identity. But as the two lives longer together, they begin to develop feelings for each other, can Taecyeon make the necessary sacrifices for her live peacefully again?