Business tycoon Gu Tian dies in a car accident and unexpectedly reincarnates as Lin Wanwan, a poor widow. He discovers that he now has a sick daughter, Lin Xingwan, who was conceived during a one-night stand seven years ago. Determined to uncover the truth behind the accident and reclaim the Gu Group, which was stolen by his assistant Yu Chen and business partner Wang Tingzhi, Gu Tian joins forces with his childhood friend Fang Xiuyuan, using his business acumen to rapidly accumulate wealth in the stock market and gradually infiltrate the Gu Group. Along the way, he must adapt to the inconveniences of a woman's body, including menstruation, while facing loan sharks, harassment from neighbors, and other hardships. He even enters into a sham marriage with Fang Xiuyuan to gain the support of the Fang family.