The Emperor's Caretaker Vol. 1 manga

Linhua, daughter of the Chancellor of the Right, is as gifted with caring for children as she is at playing the ehru. Her talents shine during the ceremony to select a consort for the five-year-old emperor. There she catches the eye of Souren, the highest-ranking regent. Suddenly, Linhua is swept into the vibrant world of the inner palace as a new court lady--and the young emperor's personal caretaker!