I'm not sure what's the writer trying to do. There are 5 sibling who encounter every imaginable individual/familial problem every single episode. There was no period of recovery, problem after another until the writer ran out of episodes otherwise she would keep writing more problems. The problems didn't really help progress the story as much as just prolong its run. There's no real development. After the end credits they will get back to being their usual miserable selves but maybe they will drag more people into their misery now they're married. The formula is simple and the fix is even simpler. Reduce the amount of ridiculous problems, give the characters more depth and bigger problems rather than more problems. These problem should be characters defining type of problems.

If I had to take a guess, the writer mainly writes daily dramas and writing for a smaller series was an unfamiliar territory for her. This showed by how things changed around the end, just like any daily drama. The change came because they ran out of episodes. I wanted to like the drama but it's in a non-functional state. Yet, it had some nice moments and some dark humor at times which makes it kinda watchable.

Shim Ran raped We Sang while unconscious, got pregnant, had a baby and gave him the kid to raise. In what world is that acceptable? The drama made a big problem of the smallest things but somehow they brushed off this matter like nothing and didn't get more than a couple of scenes. I think Shim Ran had a total of 4 scenes in the entire thing. There were several other examples just like that, this is how the writer treated most of the problems. They were added just for the shock value.