Diao Chan is a fictional person, so why did Lü Bu betray Dong Zhuo? In reality, it was part of Yuan Shao's plot. He bade Lady Zhenji ride to Hu Lao Gate alone. When Lü Bu came out to fight her, she tooted her flute in a sexy way. Lü Bu invited her into his quarters, whereby she suggested the plan to assassinate Dong Zhuo. When she was leaving, Zhenji made Hua Xiong deepthroat and choke on her flute.