The Rarest Diamond

Akira Diamond Park is the heiress of Park Group Of Companies, the largest group of companies in the Philippines. As a heiress she lived all of her life being the almost-perfect daughter, everything her parents told her to do so is a MUST meaning she can't disobey what her parents wanted for her. All of her life she's been attached with the word 'High Expectation' who wouldn't have high expectations from her, she's beautiful, she's smart, she's talented, she's rich, and most of all she's a Park. But despite of her being an almost perfect, we can't deny the fact that everyone has their own flaws, the only problem on her is that she has a bitchy attitude. She has been living her life to the fullest, enjoying what she have, and busying herself to become a future successor. Nasanay na siyang laging sinusunod ang mga magulang niya not until she met the guy whose name is Kai Ryosuke Watanabe.

What's his role in her life?