你的世界里我永远是配角
[nĭ de shì jiè lĭ wŏ yŏng yuăn shì pèi jiăo]
Translating to 'In your world, I am forever the supporting role,' it expresses the sorrow of being secondary or less important in another person's life, suggesting a longing to be acknowledged more deeply or loved wholeheartedly by the other.