目中无人 (mù zhōng wú rén)

to consider everyone else beneath one (idiom); so arrogant that no-one

Character breakdown

Usage

他成功后变得目中无人,谁都不理。

After his success he became arrogant and ignores everyone.

Tā chéng gōng hòu biàn de mù zhōng wú rén, shuí dōu bù lǐ.