Three Kingdoms: Guan Yu's Son-in-Law? No, I'm the Ruler of the Great Han

Modern man Liu Yang transmigrates to Jiangling, Nanjun, Jingzhou, in the twenty-fourth year of Jian'an. That year in history, Liu Bei captured Hanzhong, slew Xiahou Yuan, declared himself King of Hanzhong, and was full of ambition. Guan Yu flooded the seven armies, captured Yu Jin alive, slew Pang De, and shook all of China with his might. Lu Meng crossed the river in disguise, captured Gong'an and Jiangling in Nanjun, and struck from behind to seize the enemy's home base. Afterward, Guan Yu fled to Maicheng, where his army was defeated and he was killed. When modern man Liu Yang wakes up, he finds himself in Jiangling, Nanjun, Jingzhou, and has become Guan Yu's son-in-law. With only three months left before Guan Yu's defeat and death, Liu Yang thinks he can still save Jingzhou from the crisis closing in around it. He lays an ambush, kills Lu Meng, and captures Lu Xun. An eye for an eye. Liu Yang strikes back at their home base. If Sun Quan can raid his home, so can Liu Yang. The heartland of Jiangdong becomes a battlefield, and Jianye falls into his hands. A great fire leaves the young Sun Quan wailing for his parents. Sun Quan then offers up the three southern commanderies of Jingzhou and Jiaozhou in the hope of clinging to life. He subdues the southern tribes, captures Meng Huo, opens routes to the Western Regions, and destroys Sun Quan. Sun Quan: Who is Liu Yang? He's my nemesis! Guan Yu: Liu Yang truly is my excellent son-in-law! Liu Bei: Liu Yang, I never knew you were also descended from the Prince of Zhongshan. Quickly, bring me the clan genealogy so I can examine it. Cao Cao: Damn it, Liu Yang is truly hateful! I, Liu Yang, am also a kinsman of the Han imperial house, appointed by Heaven, and destined to reign forever! I, Liu Yang, will set this Han realm in order!