What is the explanation of the story of the young servant (al-waseef) of Ma'rouf al-Karkhi? Who is this young man mentioned in it? And what was the end of the story?

The young man's name was not mentioned in the story, and the reason for not understanding it might be a missing part in some of its sentences. The story speaks of a devout boy who remembered Allah in every step, urged prayer, and then bowed and prostrated in the mosque for hours. When the man hosted him in his home, his disabled daughter supplicated to Allah by virtue of this guest, and she was cured. In the morning, the boy disappeared. This indicates the miracles (karamat) of the Awliya' (saints), which Ahl al-Sunnah wa al-Jama'ah believe in, and which appear as extraordinary occurrences, and they exist in every age.