蓦然回首身后陌上花蓦然回首身后仅留空
[mò rán huí shŏu shēn hòu mò shàng huā mò rán huí shŏu shēn hòu jĭn liú kōng]
This nickname comes from an old Chinese poem and a melancholic mood, where 'mu ran hui sou' (蓦然回首) means 'suddenly looking back'. It evokes a sense of longing and reminiscence over the past, emphasizing the contrast between the beauty that once existed and now is only emptiness.