Fox Pact: Sleep With Your Enemy

After being framed by her husband and the Southern Princess, Shen Qingzhu's family is destroyed, leaving her on the brink of death. Saved by a fox spirit named Mei Jiu, she undergoes a heart-for-skin transformation to seek revenge. Disguised as an orphan, Mei Jiu enters the manor, wins the affection of her husband, and sows discord between him and the Southern Princess. Together with Crown Prince Xuan Moheng, she exposes the Southern Kingdom's plot to restore its throne. Mei Jiu clears the Shen family's name and sees her husband brought to justice. In the final battle, Mei Jiu sacrifices herself to save humanity, regenerating Shen Qingzhu after severing her own tail, before retreating to the deep mountains. Three years later, with all nine tails restored, all grudges are settled.