(1) Kim Ngo Guard: a proper noun referring to an official position under the Tang Dynasty, whose duty was to protect the safety of the Imperial Palace.
It was difficult to sleep on a summer night, so the old eunuch Mu led two young eunuchs to the upper floor of the city gate, spread out a mat on the ground, and lay there fanning themselves while chatting. When the sound of the hook hitting the city wall made a soft "Ding, ding" sound. The old eunuch Mu also heard it and said: