I'll Let You Accompany Me in Reading, and Will You Reproduce the Xuanwu Gate for the Prince?

Travel through the Tang Dynasty and become the companion of Prince Li Chengqian. I learned that the prince rebelled a year later and was killed! The Li Chengqian in front of him was perverse and had low self-esteem, running for his own death. No one in the civil and military circles was optimistic about him, and the emperor's father had cold eyes. Advise? To please? Beg for mercy? All useless! Since being kind, courteous and thrifty can't bring you life, then teach the prince something "treasonous and unethical"! "Does Your Highness know that His Majesty killed his brother and imprisoned his father, but he wants you to be benevolent and filial?" "He is more 'rebellious' than you!" "The more perfect you are, the more uneasy he becomes!" Awakening the famous teacher system, I can save the rebellious prince with my own hands, and step on the emperor's mind. In this prosperous age of Zhenguan, I can teach a qualified prince and find a way to survive!