恋空城单城府
[liàn kōng chéng dān chéng fŭ]
'恋空城单城府' means love, emptiness or loneliness. It can express feelings such as yearning for an unattainable person or thing, feeling lonely, empty, or having a heart as single-minded but complex, perhaps reflecting melancholic, wistful feelings toward an intangible emotion, situation, or unreturned affections.