相信我不变的真心千年等待有我承诺
[xiāng xìn wŏ bù biàn de zhēn xīn qiān nián dĕng dài yŏu wŏ chéng nuò]
'Trust That I Keep My True Heart After Waiting for a Thousand Years.' This indicates deep sincerity and loyalty that remains unwavering through long periods, promising endless dedication in affection.