忧郁贯彻了我们的青春悲伤客串了我们的年华
[yōu yù guàn chè le wŏ men de qīng chūn bēi shāng kè chuàn le wŏ men de nián huá]
This translates to 'Melancholy marked our youth, sorrow played a part in our time together', reflecting on bittersweet memories shared during adolescence and early adulthood, often evoking nostalgia mixed with sadness.