The grandmother (played by Yan Ni), who was silent all her life like most people, suddenly left home without saying goodbye and disappeared, wandering around the city. She is no longer silent, but independent, like a city ranger, piercing into the lives of countless people like a sharp blade, revealing the lives of people who are difficult to determine whether they are black or white, good or evil. While changing herself, she also changed the lives of many people - including the grandmother's sister (played by Yan Ni), daughter (played by Zhang Yao), and granddaughter (played by Deng Enxi)...