C66 Huang Lao
Beijing.
The gate of the courtyard was closed all year round, and there was not even a sign on the door, not even a guard on it. People who came here often just took a look from afar, and then ran away as if they were running away. If a few outsiders came near by by by chance, there would be a few black-clothed people in sunglasses, and they would ask you to hand over your ID card for inspection