顷刻一笑换来你背后一刀
[qĭng kè yī xiào huàn lái nĭ bèi hòu yī dāo]
'A sudden smile in exchange for a stab in the back.' This name suggests someone who has experienced betrayal or deceit from another person, particularly when they were open or kind toward that individual, highlighting their wariness or distrustful attitude as a result of being hurt unexpectedly.