Time-Traveled Emperor No More a Puppet

The empress dowager holds the real power at court, and the young emperor is there to sign what she puts in front of him. Under her the emperor is deposed, shut in the prison, left without food, and finally torn apart by five horses. A man from the modern world wakes up in that emperor's body knowing exactly how it ends. He has the King's System, and he uses it to go after the dowager's faction rather than wait. He has the chief minister executed and works through her people one by one until the palace is his. He wins over the empress. He outmaneuvers the scholars, heads off a disaster before it lands, and destroys the threat from outside the borders. He crosses the desert, takes the fair-haired women there, and sets the empire's borders where he wants them.