Bulwanjeon Cinderella-mul

Jung Eon is a maid who works in the house of a rich and powerful family. She dreams of escaping a life of servitude and saves every penny she earns. One day, she receives an unexpected proposal from her childhood friend and boss, Hyun Mae-hwa. He's as pretty as a flower, but has a horrible personality. Mae-hwa says he wants to marry her because of a prophecy that says Jung Eon has six benefactors in his destiny. He thinks she is the source of his financial luck. She accepts, thinking it's a chance to change her life. Note: Includes six extra chapters.