Under the Ice Wall

After the apocalypse, on the wasteland, under the ice wall, and beside the permanently frozen sea, the remaining humans strive to stand back on the top of the ecosystem. But after all, humans still haven't learned to learn lessons. Several ordinary Alliance residents were recruited by the Alliance to participate in the investigation of a checkpoint incident. From then on, they took a completely different path from their planned life path. The ice wall begins to crack, the permanently frozen sea begins to melt, and the monsters that have disappeared from the wilderness for a long time begin to gradually wake up. How can the new generation of humans defeat those monsters armed to the teeth again? So when the ice wall completely melts and thousands, hundreds, ten thousand or more monsters that once preyed on humans attack humans again, how should humans respond? After passing through time and crossing the epoch of civilization, where should the new generation of humans go?