伤了冬初白了城乱了夏末蓝了海
[shāng le dōng chū bái le chéng luàn le xià mò lán le hăi]
It paints a vivid scene with seasonal colors, metaphorically expressing that the hurt happened at the beginning of winter and whitening the city, summer ended in chaos while the sea was covered by blue, symbolizing a heart that has experienced vicissitudes.