Lin Jin sensed his goodwill, nodded, and was about to step forward.
Suddenly, a faint sound source came from afar, neither gunfire nor the howls of zombies.
It was sharper and more continuous than those sounds.
And it had a trend of getting louder.
Lin Jin turned back and saw that not only did he hear it, but several teammates behind him heard it too.
The scout quickly jumped onto a car by the roadside and stood on it, using binoculars to look into the distance.
"Can't see clearly..."
With this said, the few people became more anxious, but without binoculars, they all tried to find a vantage point around them.
However, Lin Jin felt it was unnecessary as he seemed to have heard it clearly.
The sharp sound pierced through the hazy drizzle and the dim outline of buildings, penetrating his eardrums from three kilometers or even further away.
The sharp whistle was like some symbol of civilization, rekindling certain memories that had decayed in the acid rain.
