Plot: Four years after the official ruling of her daughter's suicide, a mother, Liu Jingli, discovers new evidence that drives her and her two middle-aged best friends—a reformed escort and a spiritual medium—to launch a road trip investigation, only to uncover that her daughter was not a victim but a "little devil" involved in schemes like bullying, extortion, and fraud, eventually revealing a final, shocking twist about her death connected to her friend's son.