空人空心空世界旧人旧梦旧时光
[kōng rén kōng xīn kōng shì jiè jiù rén jiù mèng jiù shí guāng]
It depicts emptiness and yearning for things passed - old friends, outdated dreams, and past times, creating a poetic description about an individual's internal vacancy after the departure of meaningful entities, resulting in nostalgia for those gone but unforgettable experiences