What do you mean, the seas run dry and the rocks crumble?

The seas run dry and the rocks crumble, but the feelings remain.

"The seas run dry and the rocks crumble, but you hate not burying loess";

Warmly praise the loyalty of a pair of young children who died of double suicide. Even if things change, the seas run dry and the rocks crumble, their despair, resentment and yearning for a better love life can't be destroyed even by loess.