History VS Novel

Romance of Three Kingdoms, a tale of a 300 years betrayal, loyalty and raise and fell of countless heroes. But for the most part, this story isn't base on the real history. In some historical book, it says that empty castle tactic wasn't invent by Zhuge Lian, but by Sun Jian. The story Sun Xian Shang fell in love with Liu Bei and betray her brother in order to help Liu Bei escape weren't true. Sun Xian Shang was never in love Liu Bei. Thier marriage was just a politcal setup. She even betray Liu Bei and kidnap his son in the end. Guan Yu didn't really kill Hua Xiang, it was done by Sun Ce. Cao Cao is portrait as a ruthless tyrant were that cruel in the real life. He didn't kill over thousand of innocent civilian to get revenge for his father. The story maybe awesome, but we have to know that it isn't base on the real history.