The execution of this drama, especially during the first few episodes was spot on from the webtoon. The addendums they added, like the second life of Seo Ha's mother, the relationship of Min Ki to Ji Eum, and how the uncle of Seo Ha surrendered were great and honestly top-notch.

What led to the downfall, in my personal opinion, was the number of flashbacks they used and reused in the entirety of the show. In Episode 12 alone there were three flashbacks already. It was too time-consuming; time that could've been used to add more story and depth towards the ending they gave.

Then there's also the ending, since Ji Eum will not be remembering Ae Kyung, who would've brought her up? Who would be with her during her formative days? Since there's no Seo Ha, what would make her dedicated enough during her younger years to persevere?

The ending they gave- which was VERY different from the webtoon, became too full of plot holes. While it was a meet cute kind of ending they presented, it left too many plotholes in place.