深巷旧年少女依旧独守空城
[shēn xiàng jiù nián shăo nǚ yī jiù dú shŏu kōng chéng]
This translates as 'In old alleyways, the young girl remains alone, guarding an empty city'. It depicts solitude and lingering emotions. An allegorical expression for isolation, perhaps even nostalgia and unyielding patience or hope.