He works for Wu and Zhuge Liang is in Shu. He actually appreciates Zhuge Liang, but Zhuge Liang is too loyal to Liu Bei. He can't make Zhuge a member of the State of Wu, so one day Zhuge Liang will definitely attack the State of Wu for the sake of Shu. He thought that this man would be a great disaster for Wu, so he made such a sigh.
That is to say, since I was born to help Wu, why did Zhuge Liang come to revive Shu and ask him to fight against Wu?
Zhou Yu said this sentence not for himself, but for the overall situation of Wu!