I recommend "Wear It Quickly, The Male Supporting Character Is So Sweet". The male lead is the female lead's subordinate/supporting character. The story was about the female protagonist who transmigrated into the book and met the male protagonist after obtaining the Quick Transference System. However, her mission was not to conquer the male lead, but to save the supporting male lead. The male lead was the female lead's boss, and at the same time, he was also a great demon. The genre of this book was Ancient Romance-Classic Emptiness. I hope you like my recommendation. Muah ~