偶回首难相忘
[ŏu huí shŏu nán xiāng wàng]
This translates to 'occasionally looking back, hard to forget'. Recalling events with a bittersweet quality attached; certain moments are hard-washed from our minds once they have passed. A feeling of melancholy longing mixed with nostalgia for what could've been. Evoking an emotional yet resilient heart