Before Qiao Ran learned how to be a qualified assassin, he studied various mechanisms and labyrinth solving techniques at Guigu Pavilion. Han Mo had also read countless military books and knew quite a bit about different mechanisms.
The two of them carefully observed the surrounding setup, and finally, their gaze fell simultaneously on one of the stones struck by the waterfall.
Compared to other stones nearby, this one's surface was smooth, lacking any slippery feel of being soaked in water for a long time.
This indicates that someone frequently moves this stone.
Han Mo grasped the stone and gently rotated it, causing a stone door behind them to slowly turn, revealing a half-meter-wide gap.
The two stepped through the stone door, which slowly closed behind them.
In front of them was a narrow stone staircase, with both walls adorned with vintage and attractive lamps emitting a faint orange glow.