Jian Ning travels back in time from 2026 to 1991, disguising herself as Shen Jing to protect her mother, Shen Shuwan. She outwits the Xu family's conspiracies, finds evidence framing the bearing, preserves the sponsored university training quota, clears the thief stigma, and matches her parents' romance. After her destiny is reversed, Jian Ning is erased by the laws of spacetime and returns to 2026, finding her mother healthy, her father alive, and the family of three finally reunited, making up for the regrets of her past life. Using wisdom and familial affection, she rewrites destiny and reaps a complete, happy home.