等一个不归人寻一颗不亡心
[dĕng yī gè bù guī rén xún yī kē bù wáng xīn]
Waiting for someone who may never return and looking for a heart that does not perish. This reflects an eternal hope in the face of loss; the person might be gone forever ('not returning'), but waiting for them represents the belief that true love will persist even beyond death.