日光独自倾城却少了旧人
[rì guāng dú zì qīng chéng què shăo le jiù rén]
This poetic phrase means 'The sunlight beautifully decorates the city on its own, but without the old friends/lovers'. This user likely has feelings of nostalgia about people from the past, missing old friends, former partners or just feeling sad during sunny yet lonely days.