I have read the webtoon, and so was actually slightly looking forward to watching this, besides the cast members that I don't like (a.k.a basically all of them). I liked the story in the webtoon and was hoping for something equally as thrilling and interesting but was completely let down by this drama. First off, the acting wasn't that good, and the male lead's hair! ugh I did not like his haircut for some reason. Anyways, other than the really annoying girl Sumin and her sidekick guy, the acting was pretty subpar. The music was meh, I don't really remember any of the songs which means they probably weren't that great because I usually pay attention to the music a lot. I think the reason I found it so bad was a) the bad acting b) the greatness of the webtoon and c) you didn't even end up liking the main character so you were basically just watching it because you hated everybody.
Honestly this drama could have been great, but it just was really disappointing. Overall, I would definitely skip this one! Its not worth the time and brain cells you lose while watching it.