I Am the Useless Ancestor of the Han Family

Very helpless, what should I do if I accidentally return to the Tang Dynasty and become the ancestor whose ancestors have been infamy for thousands of years? Han Bucheng told himself to use his hands to change himself and to use his wisdom to change the future. Although I am just a waste, I can push the gears of history to open up a different prosperous age in the Tang Dynasty. Holding the one thousand contribution points he had just earned, Han Bucheng clicked on the waste-to-talent system in his mind, hesitating whether to change the Three-Character Classic for educating future generations, or to change to another...?