You Who Called

65-Year-old Zhou Xiulan received a video that her grandson was kidnapped in Thailand. The police said they had to wait, but she couldn't afford to wait. With all her savings, she sneaked to Bangkok. On the streets of a foreign country, she met Afeng, who claimed to be her grandson's classmate. Videos kept coming - in the picture, the grandson was asking for help on the third floor of a certain "park". Grandma doesn't know that she is falling into the great darkness of the new era...