On her 21st birthday, Lu Xiaoxiao accidentally transforms into a fluffy little kitten and travels back in time to the year 2000. Destiny sends her back to the old days, to her still-young grandmother, Lin Shufen. At this moment, her grandmother is in good health, her uncle is still alive, and her mother is burying herself in preparation for the college entrance examination. All those heart-wrenching regrets of later days have not yet happened. Turned into a cat, Lu Xiaoxiao relies on various skills to try her utmost to rewrite the regrets. In the end, her uncle is safe and sound, her mother successfully gets admitted to university, her grandmother no longer has to grieve secretly over old photographs, and everyone is happy and fulfilled.