Levi Ackerman and Y/N have built a quiet, loving life together after years of surviving loss. But when Y/N is diagnosed with a rare, Ashen Vein Disease, their peaceful future shatters. As Y/N grows weaker each day, Levi desperately searches for a cure while refusing to accept the inevitable. Faced with a battle he cannot win, the strongest soldier must learn that sometimes loving someone means cherishing every moment before saying goodbye.