Why am I, the chairman's secretary, in the same bed as the chairman?!

Kim Min-gyu, the chairman of Seventeen Enterprises. His secretary, Seo Ah-jin. Kim Min-gyu became the chairman of his company at the young age of 27. Seo Ah-jin, living up to her title of "Kim Min-gyu's Secretary," became his secretary at the young age of 25 with her extraordinary intellect. When it was time to leave work, the two drove home without a second thought, Kim Min-gyu driving, Seo Ah-jin taking the subway. Then one day, a company party was held. It was a celebration of a company's