The secret of the immortals (1)

The sky was dark, and the tired birds returned to the forest.

A few martial artists at the city gate glanced at the water timer, then picked up the huge drum sticks beside them and prepared to sound the closing drum.

The strangely shaped animal skin drum would make a long sound every time it was hit, echoing in the sky above the city.

When the bell rang, the city gates opened, and when the drum rang, the city gates closed.

The evening drum and the morning bell guided thousands of families to work at sunrise and rest at sunset.

After the drum was sounded, they would wait for the time it took for an incense stick to burn, waiting for those who entered the city late.

Once the time was up, the city gate was immediately closed.

The heavy city gate made a rough grinding sound, and under the control of several martial artists, it was slowly gathering together.

If one were to look closely at the city gate, one would discover many things.