彼岸花开莫失莫哀相濡以沫花开不落
[bĭ àn huā kāi mò shī mò āi xiāng rú yĭ mò huā kāi bù luò]
It refers to a flower called Higanbana (Red Spider Lily). The phrase implies 'do not be separated or lose each other while the flower is in eternal bloom,' symbolizing enduring love even in hardship.