Guo Jia
Cao Cao laughed and said, "If what you've said is true, I feel really flattered." Guo Jia said, "Yuan Shao is now occupied in a war with Gongsun Zan in the north. We should head east to attack Lü Bu. If we don't eliminate Lü Bu first, when Yuan Shao attacks us and Lü Bu assists him, we'll be in deep trouble." Cao Cao agreed with Guo Jia.