The story is based on an urban legend that arose in Beijing in November 1995. A local bus, no 375, left its station late one night to a remote destination. An old lady and a young man were travelling on it. Three people in traditional garb waved it down as the bus moved on. When the old lady saw these people, she started a quarrel with the young man she had come up with. She accused him of stealing her purse. Startled, the man fought back.