I’m the Whole Galaxy’s Dark Moonlight

You Chenyu, former supreme executive of the Human Alliance and, after its split, head of the Empire. Signatory of the “Lyra Accord,” savior of humanity's interstellar civilization, and a tyrant in every sense of the word. Many people loved him, but more hated him. During the Alliance's great purge, all of humanity dreamed of him at midnight, standing over the heads of the old party and arrogantly sentencing everyone to death. Under his leadership, the Empire flourished, ruling with an iron fist and waging war everywhere. Imperial flags flew across countless star systems, while the Federation and other weaker civilizations could only survive cautiously in the shadows beyond the reach of the Empire's suns. Then the Empire fell into internal strife, You Chenyu disappeared, and the universe was reshuffled. A hundred years passed. The Federation and the Empire stood as equals, while the civilizations caught between them seized the opportunity to thrive and form a formidable neutral power. One day, a century later, You Chenyu woke up on a frontier planet. Then he discovered, to his horror, that his body had shrunk to that of a nine-year-old, and his abilities had weakened. He was now a frail, sickly, disabled child. Even worse, the planet had once belonged to the Empire, but was now Federation territory. The moment he woke up, he was stamped as a Federation citizen. You Chenyu: “...” Also known as: “I'm My Own Child? Is That for Real?” “What Do You Mean I'm My Sister's Illegitimate Child?” “After I Died, They Regretted Everything (Not Really)” “Bro, You're Not Dead?” “You Chenyu Never Became Emperor in His Life Because He Couldn't Forget...” Please note: 1. The protagonist isn't a traditional good guy and only loves himself. He won't do good deeds, and there will be consequences. 2. The protagonist focuses on his career and won't return anyone's feelings. Theme: Acceptance, understanding, and empathy