只怕生死相依换来一厢情愿
[zhĭ pà shēng sĭ xiāng yī huàn lái yī xiāng qíng yuàn]
Translating as 'afraid that clinging tightly through life and death may end up as unrequited', it voices a caution against loving someone who might not feel the same, warning of the possible bitter result despite all the dedication.