你非席城怎知他情深你非南湘怎知她无奈
[nĭ fēi xí chéng zĕn zhī tā qíng shēn nĭ fēi nán xiāng zĕn zhī tā wú nài]
Unless you are Xicheng, you can't know how deep his love is; unless you are Nanxiang, you can't know her helplessness. It reflects complex feelings and empathy between people who have undergone specific experiences.