"Lee young Woo is a happy and kind hearted girl who is always helping the needy. She lives not rich nor poor, but just rather good fit for a person. She one day during the summer, receives a small parcel on her 20th birthday. And as happy as always, she is receiving this parcel thinking it was her grandfather who had sented it from overseas, and it turned out to be r u b y diamonds sitting at the bottom of it. It wasn't her grandfather who sented them, it was mistakenly put in her house by a total stranger named Hyun Bin, who broke into her house, accidentally, injured by his enemies. This is going to be a tough beginning for her as she showed off the dimonds in the open and causes trouble for herself. After finding out that those dimonds does not belong to her nor her grandfather, and nearly killed because of them, she tries to find out who was the owner of them. But letting her best friend, Ahn Lee Jae,  know about it, she'd think she find the owner in no time and get her life back, but it only causes more trouble to her and her friend. In the process of finding the owner, she discovers that the dimonds belong's to a dangerous killing gang leader, Sung Kang Ho, who kills and leaves no trace behind. unfortunately, like any other drama she watches, she gets herself  involved with them by accident and falls in love with Hyu Bin, who riskes his life to save her over and over. Meanwhile, on the other side of the world- so called it, the police and head prosecutor, Jang Geun Suk, finds out about the mysterious diamond theft and they are on the trail as well.  Recieving his first task as a new commer, Jang Geun Suk, thinking that Lee Young Woo had something to do with it and not knowing how she recieved the diamonds, goes undercover to keep track on her tail like a dog on a leash. But keeping a  close eye on her for too long, he only causes himself to fall in love with her innocent side. But Young Woo is trapped in Hyun Bin's warmth and can't get a hold of herself while Hyun Bin loves her too, and is always annoyed with the daughter of his master, Sung Yu Ri. So to stay alive until the end, she has to escape from both the dangrous gang and police, w a n t e d..."