走上红地毯的那一天身边的不是我爱的人
[zŏu shàng hóng dì tăn de nèi yī tiān shēn biān de bù shì wŏ ài de rén]
The nickname depicts a momentous event (a wedding ceremony represented by the red carpet) marred by deep regret and unrequited love, expressing heartache because one’s partner on this important day is not who they truly love.