Rebirth and Control of the Apocalypse

Xilou, who is a senior member of the research institute, reopened his eyes and went back to twenty-one years ago! Xilou, who knows almost all the history, is destined to be a legend in this life. In the last days when heroes are divided among themselves, how many people will become emperor? How many people are kings? It's a pity that they are just chess pieces in my hands. Only I can control this world!