I Summon the Heroes of the Two Song Dynasties from Another World

In the mainland of China, the princes are fighting in a melee. Emperor Gaozu accepted the order to destroy all the countries, reject the Eastern Yi, conquer the Southern Barbarians, conquer the Western Tamarins, conquer Beidi, and build the Great Yan! Since then, the world has been unified. However, more than two hundred years have passed, and the contemporary Emperor Yan is arrogant, extravagant and licentious. He is obsessed with success and is headstrong. He has repeatedly conquered Beidi and returned without success. Most of the civil and military officials under his command formed cliques for personal gain, took bribes and perverted the law, and disregarded human lives, which made the people of Yan miserable and miserable. Zhang An, Dong'an County, Langya County, Xuzhou opened his eyes