The Prince of the Tang Dynasty's Survival Guide

My dad is Li Longji. My dad killed three of my brothers. My father's right-hand minister is Li Linfu. I knelt in the Xuanzheng Hall, my knees ached, and the scrolls fell from my head. I know what will happen in the next fourteen years - the Wei Jian case, the Du Liangdi case, the Liu Ji case, each one has a death. But I've read all the historical sources. I know how everyone will die, I know how every game of chess will end. Now, I am Li Heng.