剩空城留空心
[shèng kōng chéng liú kōng xīn]
The term '空城'(kōng chéng) literally translates to 'empty city'. It describes the feeling of someone left alone in an empty place. This can symbolize feelings of loneliness and solitude, with nothingness all around. In other words, an abandoned heart stays in an uninhabited city.