The synopsis is just awful and a sign that even MBC don't have a clear plan for the drama. Which was confirmed very shortly within a handful of episodes. It was solidified even further when the female lead Lee Ga Ryeong dropped out of the drama by episode 46. They didn't replace her with another actress, they just removed her character entirely. The drama went through a big shift after that, hopelessly trying to adjust the story but there was no saving since it was unserviceable from the very beginning. The old man love relationship was unbearable to watch. This might be the worst "family" centered drama which is weird because it's really hard to fuck up a family drama.