Choi Seunghyun is a top notch cop, respected by all in the field. Despite his young age, his ambitions and achievements have earned him the nickname TOP. He meets a girl by the name of Lee Eunji and soon falls for her. Of course, things aren't as great as they seem. He discovers a secret about the girl he loves that could either make or break him.

Lee Eunji is a modern day Robin Hood. She is an infamous thief who has been wanted by cops since she was fifteen. Eunji is notoriously known as Blood Diamond. She grew up in a poor neighborhood and is well aware of public troubles. While the rich get richer, the poor gets poorer. She steals but donates. Eunji meets a guy, a cop, to be exact. He's the best in his field. She has to make the choice to either leave the guy she loves or stay and get arrested by him.

Both are forced to battle each other, who will come out victorious, Blood Diamond or TOP?