如果能重来我定不负你
[rú guŏ néng zhòng lái wŏ dìng bù fù nĭ]
Means 'If it could start over, I would not let you down.' A remorseful promise indicating deep regret over a past relationship failure but with firm intention to redeem oneself if given another chance. This signifies hope and longing while reflecting on past mistakes.