人在曹营心在汉

人在曹营心在汉

Literally means:

be physically in the Cao camp but one's mind is in the Han camp

Actually means:

be half-hearted

Guan Yu, the well-known general during ancieb China's Three Kingdoms period, received very favorable treatment in the Cao's camp, but was bent on returning to Han to which he belonged.

This phrase figuratively means although one is physically in one place, his mind is set on another place. Derogatory.

三国大将关羽虽然在曹操的军营中受到优厚待遇，却一心想回到自己所属的蜀汉。

比喻人虽然在某个地方，心却在另一个地方。具有贬义色彩。