When Qin Zheng attends her son's parent-teacher meeting, she unexpectedly discovers something strange in his essay. After investigating, she learns that seven years ago, her husband, Xie Chuan, and his mistress, Song Ran, conspired to switch her biological child with their own at the hospital. They sent their child to live in the Qin family in place of hers. For years, they had also been secretly drugging Qin Zheng, driving her mentally unstable so they could seize all of the Qin family's wealth. At the critical moment, Qin Zheng regains her sanity, finds her long-lost daughter, and gathers the evidence needed to expose their conspiracy to the world and bring their crimes to justice.