唇角谎言耳畔蜜语
[chún jiăo huăng yán ĕr pàn mì yŭ]
The literal meaning refers to 'lies at the corners of one’s lips and sweet whispers beside one's ear', usually indicating seductive or deceiving words spoken gently and intimately to make the listener fall into a trap easily. The implication could also extend to romantic betrayal or deceptive sweetness.