Characters, 

Choi Sooyoung : A daughter of Mr.Choi, the owner of  the world most luxury international hotel, which is 'The Grand Blu Rocco". She's 22 years old. She lived alone in Australia but decided to go back to Korea and help her dad after he begged her. Have a silent personality because of what happened 12 years ago. Bestfriends with Yoona and Yuri. Her father is one of the billionaire. 

Jessica Jung : A daughter of Mr.Jung, a business tycoon from America. She's 23 years old. She came to korea with her baby sister, Krystal to handle their father business in Korea. Their parents would alway come back and forth from America to Korea to visit them and also business. Bestfriends with Tiffany. 

Krystal Jung : Jessica's baby sister. Help her sister to handle their father business. Live in korea with her sister. Take a part-time dancing class due to love dancing. 

Im Yoona : A daughter of Mr.Im, who own the most popular and best hospital in Korea. She is Sooyoung's cousin and also Sooyoung's bestfriend. She's also bestfriends with Yuri. She's 22 years old. Help her dad with the hospital. And also take dancing class because of passion. Her dad is one of the richest people.   

Kwon Yuri : A daughter of Mr.Kwon, own all the international travel agencies all around the world. He even own all of the airports in Korea. Bestfriends with Yoona and Sooyoung. She's 23 years old. Help her dad to handle his business as well. Her father is also one of the richest people. Currently dating Tiffany. 

Tiffany Hwang : Jessica bestfriends and also Jessica assitant. She met Jessica since they were in America. They studied together. Then decided to move to live in Korea since it is her mother hometown. She's 23 years old. Mr. and Mrs. Jung also treat her as one of their daughte since her parents died. Yuri's girlfriend. 

Note: Red italic texts are thoughts.