既不回头何必不忘既然无缘何必誓言
[jì bù huí tóu hé bì bù wàng jì rán wú yuán hé bì shì yán]
A deep sentiment, 'If We Don't Turn Back, Why Keep the Memories? If We Are Doomed Not to Meet, Why Swear Oaths?' questions the significance of memories, love, and promises when knowing it can't be relived. It expresses helplessness and pain of a doomed relationship.