At the End of the Sui Dynasty and the Beginning of the Tang Dynasty, I Made the Decision

Li Zhan traveled to the late Sui Dynasty and became a preparer of the left and right preparers! As soon as he crossed over, he heard several roars like cows roaring. Others didn't take it seriously, but he was very curious! Curiosity killed the cat. Later, he saw a man bullying a woman. He immediately acted bravely and was involved in the three campaigns of Goguryeo during the Sui Dynasty. Then, things got out of control and the world was in chaos; At a time of great upheaval and upheaval, how should Li Zhan and his group of heroes and Jiao'e survive in the troubled times? Bashu and Hanzhong, these two places that were not exposed to war during the chaos of the late Sui Dynasty, how did Li Zhan manage them? And how step by step he grew from a small person with no ambitions and just wanted to survive in troubled times to a world-dominating hero...