Han Jisung aka J.ONE is a specially trained police team leader who is lively and smart.Standing first place in the police academy,he takes pride in his family history and himself.But in reality he is quite oblivious to romance.. So when he is assigned into a group to find out the 2 biggest mafia's groups secrets,he is stuck with 2 of his childhood friends...a puppy and..a little chick.. It's not that bad right?? But what if they were attracted to him? What if the people(mafia's)he was supposed to investigate takes interest in him? What will he do when.. "listen here jisung.You are mine and mine only you hear?" they're not willing to share?