My pretty bodyguard is a genius

Every day for the past 10 years has been nothing but hell for Min Yong-sun as he couldn't forget the day his father was killed brutally. He spend his whole life building an empire that represent power and dominance with his twin brother. They both run an underworld group which nobody knows about. Hyun Areum a fallen heiress was hired to be Min Yong-sun bodyguard. But her look didn't fit the position of a bodyguard so she was asked to take on the role of a PART so as to protect her boss silently without bringing unnecessary attention towards herself. She worked as a bodyguard and planned her revenge on her enemy silently without raising suspicions. As the time went by the cupid arrow was shot and it hit the boss and his pretty bodyguard. There was a spark between them but would this spark make a bigger fire or would it be put out before it starts?