七十億分之一的代替品 (Qīshí Yì Fēn Zhī Yī De Dàitì Pǐn)

Background
"七十億分之一的代替品" is an original Luo Tianyi song. A girl (Tianyi) laments about how she feels like just another person among billions, and her disappearance wouldn't affect anyone or anything. Eventually, she would just be replaced by yet another person.