Sandara Park is a girl, a nerd girl actually, who needs a boyfriend to get a revenge to her ex-boyfriend. But because of the help of her best friend with wide imagination, she rented one for 2 months. But she never thought that she rented the wrong one. The wrong one indeed. But she might admit it or not, it's the bestest thing that happened in her life to be with the wrong rented man. 

And to fell in love to that mobster.