In Chang'an BC, eighteen-year-old Wang Mang woke up from the severe pain of his horse falling to the ground, but his soul had been replaced by Yang Feng, a modern mechanic 1,800 years later. He became that complex figure who was remembered as a "usurper of the Han" in history books, but who also implemented shocking reforms - the young Wang Mang in the late Western Han Dynasty. History goes astray here. Facing the empire that is about to end, his relatives who are looking at him, and his disgrace in the history books, he is unwilling to be a puppet on strings with his future memories and technology. Now that we know the cards of destiny, why not recast the gears and turn things around?