Lee Hana (24) :

You're cheerful and hardworking girl. Since you graduated form Seoul National University in Bussines Majority, you work at you father's company. Your father and his best friend, the kim's, join a fashion and design company. They built it since their young and its wery succesfull and has gone international. the company have many branches including Japan, London, and New York. The Kim's took the responsibilty in New York while your parents in London. Your older sister and her husband took the responsibility in Japan. And Myungsoo the only son of The Kim is the ceo of the company in seoul while you is a step below him but you both share the same authority. 

Kim Myungsoo (27):

He very firm and you have always to be on time on work and he sometimes perfectionist. If you don't know him he seems cold and different from the other guy. but if he walk past through a worker he will smile and greet you back. He is not arrogant nor full of himself, that's the reason why most of the girls in the company fall for him. 

yeah, most of the girl except you. you've known him since chilhood but both of you're not close enough to be called friend. Even sharing the same school and university still not make both of you close. it doesn't mean both of you hate each other but it just not close to each other. knowing after graduate all you have to do is running the company, its a big burden. every single time you have is just to learn about the company. after entering the company the relationship between both of you is just work and work. even during family dinner you don't interact much, just simple introduction and work stuff.