Northern Xinjiang, Shule Ancient City.

Thirty years of climate have made everyone here accustomed to underground life.

However, the vast majority of people still do not give up the chance to climb out of the ground and breathe fresh air for a total of six hours, twice a day, in the middle of the night and in the morning.

Guyao, as the gatekeeper here, absolutely takes longer to breathe fresh air than all the people in the ancient city of Shule.

Because every time he was the first to go out of the ground and the last to close the gate to the ground.

In the past 30 years, Guyao...