This K-Drama had the potential to be one of the best but the second half of it was such a letdown

Why did I like the first half so much? The main couple were undeniably adorable, the story between Myeongmal and the deity made me curious, the second lead couple were decently interesting [keep this in mind], and the main female lead's story about her terminal disease was also interesting. As a video student, the cinematography was just genuinely amazing. On top of that, Ailee's OST "Breaking Down" was undeniably one of the best OST's there are.

But what happened to it? Why did I ended up giving the story a 6 and rewatch value a 4.5?
It was genuinely draggy, the story between Myeongmal and the deity was built up and it was at its climax but they didn't explore it deeper, the second lead couple became boring and toxic. Kevin's scenes [the Aunt's canadian boyfriend] could've been swapped with a story for the deity. They also didn't explore Dongkyung's disease any deeper.

Now am I saying that I hated the second half? No. As much of a letdown it was, I still liked it. I liked Seonkyung's story of discovering what he wanted at the end, Joo-ik leaving the publishing company to create his own, the main lead couple was once again adorable, the editorial team had a better story than the second lead couple even though they were only there for a few episodes.

Overall:

I didn't regret watching it but would I rewatch it? I want to say yes but I would not waste 16 hours re-watching this one. It was a decent k-drama with pretty cast, pretty ost, pretty cinematography but boring writing [at least for the second half].