Jiang Zao is reborn on her wedding day, overhearing guests discuss the switched marriage partners. In her previous life, she married Jiang Jinfeng and lived comfortably as the richest man’s wife, while her stepsister Xia Chuwei married Fu Yanci and suffered after he became a fool in a car accident. Xia Chuwei has also been reborn and switched their engagements two days earlier, leaving Jiang Zao to marry Fu Yanci and Xia Chuwei to marry Jiang Jinfeng. Knowing Fu Yanci will have a severe car accident at ten o’clock, Jiang Zao immediately leaves the lounge, takes her friend’s car keys, and drives to the scene. She breaks the car window and pulls Fu Yanci out just as a tanker truck crashes into his vehicle. She is injured but succeeds. At the hospital, Fu Yanci’s life hangs in the balance for twenty-four hours. Old Madam Fu is devastated but Jiang Zao stays, supporting her. Fu Yanci survives but his intelligence drops to that of a three- or four-year-old child. He wakes clinging to Jiang Zao, calling her sister. Old Madam Fu, grateful, offers to cancel the engagement, but Jiang Zao refuses, stating the marriage is publicly known and she will not abandon him. Old Madam Fu gives Jiang Zao 10% of Fu Corporation shares and declares her the Third Madam Fu. Jiang Zao begins caring for the childlike Fu Yanci, speaking gently and coaxing him. She privately calculates her options: if he dies, she becomes a respected widow; if he remains a child, she continues as caregiver; if he recovers, they will have a sham marriage. She moves into the Fu family estate and redecorates the third floor with toys for Fu Yanci, who is overjoyed and calls her wife. Meanwhile, Xia Chuwei’s marriage to Jiang Jinfeng begins with a sham marriage agreement. Jiang Jinfeng insists on a marriage in name only and gives her 10% shares as compensation. Xia Chuwei signs, believing she can win him over. At the hospital, Xia Chuwei is forced to address Jiang Zao as “Maternal Aunt” due to family seniority, a humiliation. Unbeknownst to everyone, Fu Yanci’s soul has separated from his body at the moment of the accident. It now floats around Jiang Zao, invisible and inaudible. He sees everything: her rescue, her patient care, her private muttering. He hears her say that in this life he did not become a fool, only his IQ regressed, and realizes she is reborn and that in her previous life he was a fool. He follows her to a small noodle shop in a back alley, where the proprietress greets her like a regular. She orders beef noodles without cilantro, eats with methodical habits, and buys coffee and pastries on the way back. At the hospital suite, he watches her write her strategies in her phone memo. The soul remains trapped, aware but unable to interact. The story follows Jiang Zao as she establishes her role in the Fu family, gaining Old Madam Fu’s trust and receiving offers to work at Fu Corporation. She manages Fu Yanci’s tantrums and his dependence with calm authority. The narrative sets up the central conflict between Jiang Zao and Xia Chuwei and the presence of Fu Yanci’s soul, hinting at a potential recovery or awakening. The final scene shows Xia Chuwei and Jiang Jinfeng arriving for dinner at the Fu home, with Jiang Zao helping a reluctant Fu Yanci change into clothes before going downstairs.
