面善

miàn shàn xīn xiǎn

面善心险

be a wolf in sheep's clothing

miàn shàn xīn è

面善心恶

be affable of mien and evil of heart

miàn shàn xīn zhà

面善心诈

have an honest appearance but be actually full of cunning and deceit

tā kàn qi lai hěn miàn shàn

他看起来很面善。

He looks familiar to me.

tā kàn zhe miàn shàn

她看着面善。

She looks familiar.

wǒ kàn zhè ge rén miàn shàn de hěn

我看这个人面善得很。

This person looks quite familiar to me.