The Starlight Amusement Park in the south of the city has been abandoned for seven years. There were huge holes in the barbed wire, and the Ferris wheel poked into the sky like a rusty spine. Residents nearby said that they could hear children laughing inside at night, and they would cry when they laughed. Chen Shi, a sanitation worker, doesn't believe this. He cleans the street at four o'clock in the morning every day. He only cares about whether he can collect the tuition fees for his son this month. Until one rainy night, he picked up a candy wrapper at the entrance of the amusement park - wrapped in the candy wrapper was the student ID card of the neighbor's child who had just disappeared yesterday.