Three Kingdoms: System Three Times a Year, Limited to Three Years

One is Liu Huan, who was the first to be reborn and time travel, but only got three years of system experience! Liu Bian, the young emperor whose soul has penetrated, has the right to use the system for life. When the Han Dynasty fell, the major princes also awakened their memories of past lives one after another, and everything was different from historical facts. What will happen? (PS: The first few chapters are devoted to the virtual character Liu Huan, paving the way for subsequent arrangements. I don't like the sudden addition of an inexplicable military commander)