Dream Back to the Three Kingdoms and Defect to Boss Cao at the Beginning

The protagonist Fusu accidentally traveled to the end of the Eastern Han Dynasty on his way back to his hometown. He knew that the world would be divided into three parts in the future, so he packed his bags and joined Liu Bei. However, modern people and ancient people had different ideas, so they often quarreled. Zhang Fei slapped the protagonist hard while he was drunk, and the protagonist immediately defected to Cao Cao. In order to avenge that slap, the protagonist decided to help Cao Cao dominate the world.