At two in the morning, the doorbell rings again and again, completely shattering the peaceful life of Cheng Xuyuan's family. Neighbor Ma Lifen harasses them late at night under the excuse of forgetting her access card, even forcing them to sell their apartment at a 50% discount. To protect his wife Lin Anning and daughter Manman, Cheng Xuyuan chooses to keep access logs, recordings, and surveillance evidence. As the conflict escalates, property management, neighbors, the school, and online public opinion get successively drawn in. A seemingly ordinary neighborhood dispute hides deeper calculations beneath the surface. When Cheng Xuyuan stands at the press conference site with complete evidence, all lies are finally exposed.