Lin Nian is reborn at the age of seven and witnesses her older sister about to be lured into traffic by Da Bai, a giant poodle abandoned by a neighbor. As the tragedy of her previous life threatens to repeat itself, she desperately tries to warn everyone, only to be misunderstood by her family. Through careful documentation and evidence gathering, Lin Nian joins forces with the police and a community doctor to expose Da Bai's deadly behavioral patterns caused by abuse. After enduring online harassment and multiple crises, Da Bai is safely taken into custody, her sister survives, and her family rebuilds its trust. Lin Nian finally finds redemption.