Medieval Total War Byzantium

Qin Ming was originally a modern college student. Because of his love for the game Total War, he accidentally traveled to a different world at the same time as the Blue Star by chance. At this time, the Byzantine Empire was in the twelfth century. There were many military warlords in the internal divisions. The society was filled with a large number of greedy nobles. There were fanatics in the east and south. There are many powerful pagan countries. To the west is the Holy See that has fallen out and many countries established after barbarian invasions. To the north are nomads and warlike Rus. At this time, Byzantium no longer lives up to its reputation as an empire. Let's see how the protagonist relies on the system to make the declining empire bigger and stronger step by step after time travel.