别回头身后不是他
[bié huí tóu shēn hòu bù shì tā]
'Don't Look Back; The One Behind Isn't Him.' Conveys a warning or a heartfelt instruction not to regret or look back on someone who was once important. It implies letting go, moving forward regardless of what follows after. The message can also apply literally while cautioning someone from dangers that aren't always visible when turning around impulsively.