Zhou Yun, an office worker living alone, purchases a new home and faces retaliation for complaining about her neighbor Wang He disturbing the peace late at night. Wang He installs high-power searchlights on the exterior wall to beam into her bedroom every night; communication, property management, and police reports are all ineffective. Zhou Yun uses a concave mirror to harness sunlight for a counterattack, resolving the searchlight crisis. Wang He continues to inflict harm by switching to building-shaker devices and spreading rumors to intimidate her. Zhou Yun secures evidence, uncovers Wang He's old decoration company fraud case, and joins forces with victims to commission a lawyer to file criminal charges. Wang He is imprisoned for multiple crimes, and accomplice Liu Li moves away in defeat. Through wisdom and legal weapons, Zhou Yun breaks through the bullying of the wicked neighbor and regains her peace.