Ascension Blazar?

Transmigrating into a game world, Leviathan finds himself dropped into the most unforgiving version yet—the Two-Pole Hegemony, where survival is a daily gauntlet. This is the worst of times: the shadow of Cold War hangs over every soul, a decisive great war remains unresolved, and doomsday trembles on the brink of ignition. Yet it is also the best of times: driven by the desperate imperative to prevail, humanity exhausts every avenue to unlock the latent potential within themselves and their civilization. Technology surges forward at breakneck speed, and mankind charges relentlessly down the path of evolutionary ascension. Amid this crucible, Leviathan is nothing more than a low-level spy—and a ten-year veteran top-tier Demon King Guardian who happens to carry a system panel.