为何旧知己变不成老友来年陌生的最亲爱某某
[wéi hé jiù zhī jĭ biàn bù chéng lăo yŏu lái nián mò shēng de zuì qīn ài mŏu mŏu]
It roughly translates as: 'Why Can We Not Remain Old Friends Next Year When We Become Strangers?' This line often from the lyrics, conveys a melancholic emotion about changing relationships and the bittersweetness of once dear but now unfamiliar individuals.