and Lü Bu's daughter. Chen Gui was worried that both Yuan Shu and Lü Bu would pose a greater threat to the Han central government if they became allies, so he advised Lü Bu to avoid having any ties to Yuan Shu. He also urged Lü Bu to build friendly relations with Cao Cao, the warlord who controlled the figurehead Emperor Xian and the Han central government in the imperial capital Xu (許; present-day Xuchang, Henan). Lü Bu heeded Chen Gui's advice and rejected Yuan Shu's offer. He also arrested Yuan Shu's messenger, Han Yin (), and sent him as a prisoner to the imperial capital Xu, where Han Yin was publicly executed. After that, Chen Gui asked Lü Bu to send Chen Deng as his representative to meet Cao Cao, but Lü Bu refused. However, after the Han central government sent an emissary to appoint Lü Bu as General of the Left (), Lü Bu was so happy that he sent Chen Deng as his representative to Xu to thank Cao Cao and the Han imperial court. Serving as a mole in Xu Province In the imperial capital Xu, Chen Deng told Cao Cao that Lü Bu was courageous but foolhardy and untrustworthy, and advised Cao Cao to get rid of Lü Bu soon. Cao Cao replied, "Lü Bu has the heart of a rapacious wolf. It's really difficult to allow him to live long. You're probably the only person who understands his temperament." He then increased Chen Gui's salary by 2,000 dan of grain and appointed Chen Deng as the Administrator () of Guangling Commandery (around present-day Huai'an, Jiangsu) in Xu Province. Before Chen Deng left, Cao Cao held his hand and said, "You're now in charge of the task in the east." Chen Deng had agreed to serve as a mole in Xu Province and assist Cao Cao in eliminating Lü Bu. When Chen Deng returned to Xu Province, an angry Lü Bu confronted him, brandished his ji at him and said, "Your father advised me to side with Cao Cao and reject Yuan Shu's offer. Now, (after following his advice,) I have gained nothing, while you and your father got promoted and rewarded. You must have tricked me! What do you have to say?" Chen Deng maintained his composure and calmly replied: Lü Bu's anger subsided. Governing Guangling Commandery After assuming office as the Administrator of