First, It has to be said that it is an adaptation from a webtoon, so sometimes things aren't going to be like they are in the real world.
I really enjoyed the first episodes, it was a great setup to the story! and the following ones were also nicely done, engaging, you wanted to root for the characters.
You liked the ones you were supposed to like and disliked the ones you were supposed to. Main leads did a great job and the side characters happened to steal the spotlight some times (that's how good the actors portrayed them).
I was 100% with this drama until the last 2 episodes, and the worst of it being the finale! extra 30mn long and felt like a lifetime!
It did not fit the drama and the characters that were so good throughout 14 episodes. A bummer because it could have been so much better, but still a solid 7