Revenge Maid

Hao Meng's family falls apart due to her piano teacher, Xiao Shan. Twenty years later, Hao Meng resurfaces as Fu Chou, a maid at the Gu Manor, where Xiao Shan currently resides as the mistress. With determined resolve, she sets in motion a calculated plan to disrupt Xiao Shan's life through the unsuspecting figures of her husband, Gu Linfeng, and son, Gu Xun.
(Source: DramaWiki)