Why Has Your Highness Rebelled?

In the eighth year of the Jingtai era, at the Hall of Supreme Harmony. Zhu Qiyu stood atop the imperial steps. Behind him was a ten-year-old child. Below the steps stood the civil and military officials, all wearing impassive expressions. He sighed, then looked up at his panic-stricken elder brother. At last, he asked the question he had kept buried in his heart. “Your Majesty, why have you rebelled?” P.S. Warning: the protagonist is a schemer and won’t be pursuing technological advancement