This is the first weekend-family Korean drama I've watched! I've attempted to before, a couple times, but ended up concluding that they just weren't my thing. I don't exactly know what pushed me to try and watch this one, I think I saw a comment here on MDL, on the upcoming "Once Again" drama, criticizing this one and curiosity got the best of me, though I'm glad it did.
Now I think I understand what the appeal is: you get really attached to the characters (regardless how one-dimensional they can get), their stories and their growth. Though nothing especially interesting happens, just watching their journey becomes enjoyable and pleasing. It gives you a nice feeling of familiarity every time you play a new episode. Also every plot line has interesting aspects so when one becomes momentarily uninteresting the other makes up for it and viceversa.
In any case, with all the previous weekend family dramas I tried (not many though) I never got this attached or cared for the characters this much, so this one must have something special. Maybe how likeable most of the characters are or become eventually. When it ended I surprisingly found myself feeling a little nostalgic and sad.

Story - 8.0 - The plot is far from original or fast paced, besides I'm not gonna sit here and pretend that a weekend 100 episode drama didn't drag the plot, sometimes some scenes where unjustifiably long and some situations repeated one or two many times. Therefore I skimmed parts (yeah I'm a skim watcher). Nonetheless the characters, story and its end are heartwarming and worth the watch.
I, unexpectedly, really enjoyed Cheong Ah's character and I think she is what makes this drama good. At first I thought she would be your typical Mary Sue but no, she was nice and warm-hearted without being a pushover, and she was forward with her feelings without being too clingy. She wasn't a perfect character and sometimes she made choices I didn't agree with or annoyed me, but she was relatable and I liked her mentality and recilience.
Although for me the best character was Kang Shi Wol, I enjoyed all of his appearances and I wish he had been more relevant to the plot (got major SLS with him but I still liked the OTP).

Cast/Acting - 9.0 - I loved Seol In Ah and Yoon Park though IMO Lee Tae Sun stole the show (rated it a 9 for introducing me to him). Everybody loves Kim Jae Young and I think he has lots of potential but he's still a little wooden/stiff for my taste. Everyone adored Oh Min Suk's acting on this one, and I enjoyed him but I don't think he was as outstanding as I've seen people claim. Everyone else was okay (with some exceptions here and there).

Music - 6.5 -Music wise it wasn't memorable enough for me to even recall the songs, but at least as far as I remember it wasn't distracting or annoying.

Rewatch Value - 7.0 - I mean it's a family very long drama so I probably won't rewatch but I don't rule out visiting some scenes in the future.