House Husband？He is Supreme Ghost Lord！

Kim Jae Hoon lives as the useless son-in-law of a rich family, married to Han So Hee, their only daughter, and put up with by all of them. He is a thousand years old. Han So Hee's grandfather had been his disciple, and on his deathbed the old man asked him to look after the family for three years, so he married the granddaughter and stayed. The family looks down on him for the whole of it and he says nothing about who he is. The three years end and he leaves, and the divorce goes through. Then one crisis after another hits the family. Han So Hee learns that he is a physician of great skill and the man people address as the Ancestral Master, and that he had been the one holding the family up. She apologises. He accepts the apology and goes off travelling, and she sets about rebuilding the family herself.