My mother-in-law guards the door for me

Nine months pregnant, Xiuyun is gentle and kind. Just as she's about to give birth, her husband, Zhang Fugui, is caught having an affair with his mistress, Xiaotao, at home by Fugui's mother. Fugui's mother has long disliked Xiaotao, and to avoid upsetting the heavily pregnant Xiuyun, she lies and claims Xiaotao is a distant cousin. Xiaotao, learning that Xiuyun has received compensation for her family's land, immediately seizes the opportunity to feign pitifulness and stay at the house, determined to swindle the money. After moving in, Fugui's mother targets Xiaotao at every turn, forcing her to do laundry, chop wood, and cook, constantly guarding against her seducing Fugui and harming Xiuyun.