我在身后你快回头
[wŏ zài shēn hòu nĭ kuài huí tóu]
'Wo Zai Shenhou, Ni Kuai Huitou' means 'I'm behind you, turn around.' This conveys a sense of regret or longing for missed opportunities where someone may wish they were more noticed or acknowledged by another, particularly relevant in situations of lost love.