In 2187, Earth's civilization collapsed in the "Great Annihilation" war, and the remaining humans huddled in underground fortresses to survive. Ling Yue, a top space-time engineer, in order to reverse the fate of civilization's destruction, piloted the unfinished space-time ship "Guixu" and forcibly anchored the key node before the outbreak of the war - 2077, a "golden age" with rapid technological advancement but hidden dangers.
However, the turbulence of time and space tore apart the coordinates. When Ling Yue woke up, he found that he had fallen into a "parallel 2077" that has not been recorded in history: here there are biomechanical technologies that transcend the times, and there are also mysterious organizations called "lawful ones". They seem to have been aware of the existence of "outsiders" and madly hunt for anyone who tries to change the trajectory of history.
With the technological blueprint of the future and the memories of the end of the world, Ling Yue avoided the pursuit of the "lawful ones" while looking for a way to repair the space-time ship, but unexpectedly discovered that the "Great Annihilation" in this world was not a natural disaster, but a human-controlled "civilization screening plan." In order to protect his newfound companions and to find a way for mankind in the end of the world, he was forced to take up the banner of "Time Defiant" and unite with the resistance forces hidden in the dark. In the whirlpool of technology and conspiracy, trust and betrayal, he launched an ultimate game across time and space with the man behind the scenes who controlled destiny - what he wanted to change was not only the outcome of a world, but also the return of two civilizations.
