58-year-old Tao Xiulan spent over twenty years repairing cars and now works as a security guard at Jinlan Mansion. One afternoon, a couple drove a luxury car back home, but she sensed danger from the abnormally sunken tires and the driver's shaking hands, and decisively called the police to lock down the compound. Facing protests from residents, questioning from colleagues, and pressure from the car owners, she persisted in investigating. The seemingly ordinary vehicle inspection gradually uncovers the secrets of a wealthy couple and a conspiracy threatening the residents. An ordinary auntie security guard whom no one believed protected a gate with her experience and sense of responsibility, stepping closer to the truth.