Three Kingdoms: Become Boss Cao's Golden Bodyguard at the Beginning

Lu Yu, a history fan, travels through the Three Kingdoms. He wanted to use his familiar history to make a big splash, but was told by the system that there was no novice gift package and he had to go to Cai Yong's Mansion to work as a bookboy for three years. During this period, he and Cai Wenji secretly fell in love, but at the end of the three-year period, Cai Wenji wanted to marry someone else. Fortunately, he completed his mission at this time and received Yue Fei's inheritance. The system sent him another task to escort Cao Cao, who failed to assassinate Dong Zhuo, to Chenliu. How will the gold-medal bodyguards around Cao Cao rewrite the history of the Three Kingdoms?