我姓刘却不能留下你心你姓索却不能锁住我心
[wŏ xìng liú què bù néng liú xià nĭ xīn nĭ xìng suŏ què bù néng suŏ zhù wŏ xīn]
Translating to 'my surname is Liu but I cannot keep your heart; your surname is Suo but you cannot lock my heart,' it poignantly expresses a feeling of helplessness and unreciprocated emotions, highlighting the mismatch between the two individuals' feelings.