From Webnovel:
In the Year 2056, a teenager clad in a tactical vest, combat pants, and alloyed combat boots sat atop a ruined and shattered six-story apartment building. The building lies in a Prefecture-level city in the Original Jiangsu area. With a Hexagonal Shield and a Bloodshadow Combat Sword on his back, the young man sat silently on the edge of the roof. Under the brilliant hue of a starry night, it brought forth a breath of fresh air as the night breeze caressed his body. However, within this now ruined city, all was silent... all except for the occasional chill-inducing howls.

Original Web Manhua