Suisui sees her mother, who has been missing for ten years, in a disaster victim's photograph, and learns that her mother was trafficked back then. She is reborn back to age six, desperately blocking her mother on the day she is about to board the G217 train, and blurts out the name of the human trafficker Cao Xingfa. The train makes an emergency stop, and the father and daughter track along the sugar beads left by the mother, successfully fighting the human trafficker together to rescue the mother. Although the mother is left with psychological trauma, the couple transforms into anti-trafficking guardians, using their personal experience to warn more people.