Andy dies on a mission only a few months after she gets Quynh back, and Quynh is absolutely distraught and simply does not accept that this is the end.

She goes to the underworld, Orpheus and Eurydice style, and pleads her case. She tells such a moving story about their love that she succeeds in convincing Hades/insert god of the dead here to give Andy extra years of life—the precise number of years that Quynh was in the water for, to make up for that long separation and all the agony they went through. And then, even better, he promises that after those centuries pass, he will take Andy and Quynh together at the same time, so they won’t have to be separated again.