In the mystical, subtropical province of Guizhou, there is a small county clinic surrounded by fog. At the Kaili clinic, there are two doctors who live quiet, lonely lives. One of the doctors, Chen Sheng, embarks on a journey by train to find his nephew, who had been abandoned by his brother. On the way to Zhenyuan, Chen Sheng came across a place called Dang Mai, where time seemed to flow both forwards and backwards, the lives of the local people a complete mystery.