思念是一种病久久不能痊愈
[sī niàn shì yī zhŏng bìng jiŭ jiŭ bù néng quán yù]
This username, roughly translating to 'missing someone is an illness that cannot heal for a long time', expresses the deep, persistent feeling of longing or missing someone which has become a lingering pain in one's heart. It reflects sadness about unfulfilled wishes or the absence of important people.