面下拂颜冷却了谁的心
[miàn xià fú yán lĕng què le shéi de xīn]
The literal translation doesn't make much sense directly because it's quite poetic in Chinese. This means someone's beautiful appearance hides a cold heart; in short, don’t judge a book by its cover. Looks can be deceiving and underneath a charming exterior lies coldness toward others.