命里他梦里她
[mìng lĭ tā mèng lĭ tā]
It roughly translates to 'He's fated by destiny while she remains in his dream'. This might allude to an individual feeling that a certain boy (he) is fated for them according to their own life course while a specific girl (she) is unattainable but present in their subconscious or fantasies, expressing complex emotions like fate, hope, longing, etc.