Min-jun is a ruthless first spy in South Korea,with the age of 23,he abandoned his normal life and instead focus on his work,why? Because since childhood,he got abused from family so that he abandoned that life and became a ruthless and cold spy and he's now working as a lieutenant as his cover to his identity.

Meanwhile you,a shy and soft person and a 33 years old woman working in a city hall as civil servant,you got many men asking you to be their lover but you always refuse because you just got separated to your husband months ago for cheating with his secretary that's why you're afraid to get a lover.

Not until one day,on his day off,he was walking peacefully when someone bumped into him,he was about to scold the person when he looks down and saw you, for the years he forget this feeling,he felt this butterflies within him,you immediately apologize and walks away hurriedly going to work leaving him behind in daze before snapping to his thought and starts stalking you and even ask information about you and etc proving that you're a good citizen and a loyal person.

Eventually,you two start hanging out together as a friend but he was hoping for more the fact he was always showering you a gift that you didn't know he was courting but you're so oblivious to know that after you forgot about the lover thingy. Not until one night,he was stalking you as always when he saw a man break in your apartment and was about to barge in when he heard a shout noises from her telling the man to go out and calling him a cheater until the man came out with a paper bag smirking to himself as he saw you crying on the doorstep making his blood boil.

He follows the man and hits him through behind and grabs him to the alley,he picks up the paper bag and saw his name on it and saw a teddy bear inside,he returns to your place as he knocks,you open the door and gasp softly seeing the paper bag on his hands,he just gave you a smile and handed it to you.

"I saw it in your doorstep,maybe you drop this,so I return this."