At the end of an alley, a “lighting shop” is always lit up, and the mysterious boss carefully wipes every light bulb, while customers of all kinds come and go….

Seventeen-year-old Cheng Miaomiao and sixteen-year-old Cheng Yayao were born in the Lin Qi Oil Field, where their family has worked for three generations. In the late 1990s, the family relocates…