I, the Eldest Son of Beiliang, Beat Emperor Zhenwu to Tears at the Beginning

My name is Xu Changsheng. I traveled through time and became the eldest son of the Northern Liang Palace and the biological brother of Xu Fengnian. The good news is: he comes from a top wealthy family. The bad news is: he is dying of illness. The worse news is: My cheap brother will be the Zhenwu Emperor who will penetrate the sky in the future, and the system predicts that I will be beaten to death by him in the future! Good luck! I can't beat Emperor Zhenwu twenty years from now, but I can't beat you at the age of five? "Xu Fengnian! Have you made Master angry again? If you don't copy the Tao Te Ching a hundred times today, don't eat dinner!" "Nangong Pushe, right? Stop looking for it. I have all the secret books you want. Call me brother and I'll protect you!" "Old Huang, don't go and die, come back! I'll teach you a sword, and you can go for a walk in Emperor Wu City and scare that old man Wang." I, Xu Changsheng, the only king of Northern Liang! Not convinced? Ask my brother's fist if he will answer! (Xu Fengnian had a bruised nose and face: "Brother, I don't dare anymore, not anymore...")