As Flowers Fade and Fly Across the Sky

花谢花飞花满天 (original title)

Synopsis

Hua Mantian, the son of a wealthy and powerful family, finds himself in an unwanted love triangle between a princess and his childhood lover, whom he truly loves. When his childhood lover is accused of treason, she uses magic to switch faces with the princess but their problems get deeper when the magic wears off quickly.