Yoo Youngjae,a young police detective was sent off to his undercover  job. He needs to investigate the wrongdoings of BLACK EMPIRE. He just need to send them off to jail but theres something stopped him from doing it.. NATASHA the only daughter of the BLACK EMPIRE's taycoon and he's in love with her. Not only him but both of them are madly in love with each other. The girl never knows...Yoo Youngjae is living hell in each second...What he supposed to do, he has only one option and its going to be his work or his lovely girlfriend...

Jung Daehyun is Natasha's bodyguard and they're together like 24/7. As a bodyguard and being protecting that girl for years, hes protecting Natasha more than a bodyguard but as his girlfriend. He loves her so much but he can't say it loud. Yoo Youngjae and Natasha being together really broke his heart and he hates to watch them together. Thats when he knows the truth bout Yoo Youngjae...

Natasha is master Jay's only child. She's in love with Yoo Youngjae and opened herself to love after two years. She never knows about her boyfriend's background and is deeply in love with him. Her ex-bf was a police detective and that hurts her so freaking bad. What'll happen to her when she knows that Yoo Youngjae also a police detective and doing an undercover job just to put her father to jail?