The third party is pressing closer, the son is wavering, and the daughter-in-law is despairing, putting the originally harmonious family into crisis. Retired psychologist mother-in-law Zhang Lan decided to use professional psychological tricks to break the situation: she did not fight or make trouble, but first collected evidence to take the initiative; she was neither humble nor overbearing, and accurately grasped the greed and vanity of the third party; she used both soft and hard tactics to awaken her son's sense of responsibility for the family. A carefully laid out psychological game, a joint counterattack by mother-in-law and daughter-in-law, let's see how she uses her wisdom to repel the marriage intruders and keep the integrity of the family.