Yang Zhengshan moved closer to the Houses in the center while pricking up his ears to listen to the movements around him.
In the gatehouse on the left, two courier soldiers were talking. In the room on the right, four courier soldiers were sleeping. In the stable ahead, there were six horses.
How many breathing sounds there were in each room—Yang Zhengshan could hear them all clearly.
In truth, a night like this was even more advantageous to him. The darkness could block sight, but it could not affect his hearing.
On the contrary, because the surroundings were so quiet, it let his hearing reach its limit.
If he were in a noisy environment, Yang Zhengshan would not be able to distinguish breathing sounds at all.
After a Moment, he arrived behind the Houses in the center of the relay station without making a sound.
Pressing his ear against the cold wall, he listened carefully to everything inside the room.
Three breathing sounds.
One was very steady and should belong to someone asleep; the other two were very faint.
Faint did not mean these two people were weak. Rather, it meant these two people were controlling their breathing, keeping it smooth and slow.
Yang Zhengshan was no stranger to this sort of situation. Only martial artists above the fifth layer of the Postnatal Realm could control their breathing like this.
In truth, this was a breathing technique. It was not some miraculous ability, merely a way for martial artists of the Postnatal Realm to rest.
When they could not sleep, Post-Heaven Martial Artists could control their breathing to let their bodies enter a state similar to hibernation.
In this state, the body could receive sufficient rest, and the mind could also ease its fatigue, while at the same time maintaining