Zhang Sifan, an urban white-collar worker, worked hard to buy a house. When he returned from a business trip, he found that an uninvited guest had broken into his home. Zhang Sifan, who was forced to rent out his house for "fifty yuan", secretly fought back with the help of his neighbor Liu Mei. On the eve of the exam, she made her greed pay the price by trapping the trespassers in her room with a bulletproof door. When kindness was used as an excuse for weakness, she chose not to tolerate it anymore. This is a fight back about sticking to the bottom line and using the law to protect yourself.
