Sooyoung was the only female cop in the whole team and everyone cared and took care of her but ine guy named Siwon hated her and so did she they didn't like each other at all.Sooyoung always thought he thought he was all that because he was the best in the whole team and Sooyoung also ahted him for the way that he walks, he talks she hates everything about him and so does Siwon he hates everything about her but when they are put in the same S.W.A.T team and then after that get assigned to go work undercover not as a couple but when they ask what they are Siwon had no choice to say 'My Girlfriend' but slowly they start to fall for each other until Sooyoung gets shot because of Siwon. Siwon still can't accept the feelings he has for her but on one situation when he has to kiss her he felt something different kissing her and finnaly accepts the feelings he has for her and one night when they had to hideout in a hotel he ask's her out and she says yes but when they get back a new female agent comes in and Siwon gets assigned to be with the new female agent to again go undercover as a married couple. Siwon had no problem becasue they were just going t act as if they were maried but when they get their he finds out the new female agent is completely in love with going up to the point of ually seducing him. When they come back the captain tells Siwon that the new female agent is his new partner but he has 2 months to think about accepting his new partner or moving to another unit but he has a tough choice because he loves the unit he is in but matters getworse when he finds out that the new female agent has gone up to the point of threating and trying to kill Sooyoung just to be with Siwon. Would he accept the offer of being with a mest up female agentwho forcefully wants him or will he leave his favorite unit in the police in order to save his love Sooyoung and get married with her like he wants?