The Famine Girl's Secret Feast

Zhou Tang marries into the He family to avenge her sister, Zhou Xue. Her husband, He Chen, abuses her. He Chen learns from Shen Yi: Zhou Tang is a mantis demon who will devour her mate when pregnant. As He Chen and his brother He Yang test her, they reveal how they caused Zhou Xue's death. Zhou Tang collects evidence, submits it to court, and justice is served. He Chen realizes Zhou Tang and Shen Yi were classmates, working to avenge her sister.