On a rainy night, Su Wan was forced to marry Gu Yanchen, the president of the Gu Group, in place of her missing twin sister Su Qing. She thought she was just dealing with the family's fake marriage, but she soon discovered that her sister's disappearance was full of doubts - the diary disappeared from the bedroom, her stepmother Liu Mei's abnormal attentiveness, her stepsister Su Lin's hostility, and the probing eyes of Gu Yanchen all hinted that this marriage contained a trap.
In order to find out the whereabouts of her sister, Su Wan secretly investigated as "Mrs. Gu" and discovered that the Su family's hundreds of billions of property was being transferred, and the trajectory overlapped with a mysterious transaction of the Gu family. During this period, her stepmother repeatedly set up traps, but Gu Yanchen gradually changed from a cold observer to her support, and the two secretly fell in love amidst suspicion.
A bigger shock followed: the blood type report confirmed that Su Wan was not a biological child of the Su family, but the daughter of the wealthy Lin family who was miscarried twenty years ago. The sister's disappearance is actually deeply tied to the wrongful accusation incident, the old grudges of the Lin family, and the power-seizing conspiracy of the Gu family elders.
Su Wan, whose identity has been reversed, is no longer at the mercy of others. She unites her biological family and Gu Yanchen to fight against her stepmother's power in the business world while tracing her sister's whereabouts across borders. In the end, she uncovered evidence that her stepmother had teamed up with Gu family elders to seek wealth and murder, rescued her imprisoned sister, and brought the villain to justice.
Su Wan not only regained everything that belonged to her, but also integrated and strengthened the industries of the Su family and the Lin family. She transformed from a stand-in who depended on others to an upstart in the business world, and joined hands with Gu Yanchen to achieve a happy ending in career and love.
