Krystal is a very famous model in Korea, one of the most anticipated commercial endorsers as well.  She signed a contract with Liu Enterprise.  Liu Enterprise handles a wide variety of businesses ranging from beauty products to clothings to autos, and many more.  However, Liu Enterprise doesn't just hire photographers, they have a team of their own.  The photographer assigned to Krystal is none other than Amber Liu, the daughter of the CEO of Liu Enterprise.  She is a very serious person, a hearthrob of the Liu Enterprise, and her true gender is hidden from the public.  Krystal and Amber don't get along right from the start, and that's where all of the problems occur.