Kang Eun Mi, is a secret agent who's job is to protect an important person or a peer. All of her life, her missions were too easy for her to handle, according to her. After working as an agent for 4 years straight one mission changed her whole life giving her all the luxurious things, respect, and the most wished by all, loved by someone special. She is the kind of girl who you could easily trust with something, secrets to be more specific. She could keep it to herself without her blurting out words that could lead to the victim to be suspicious. A bold, sweet, beautiful, kind girl she is. One thing for sure, how could she keep that one secret mission that they depend the life of the princess to her, can she continue without making the opponent be suspicious?