For me, the break up between Yeon-doo and Hyun-ho ruined the whole show for me.
I came from season 1 expecting more lovey-dovey stuff from them since they won my heart in the first season, so when I found out they had a second one, I came running to see from Yeon-Hyun couple scenes. But the drama kept on taking a different route and I could tell that the story was gonna end with their break up.
I also didn't like how suddenly the new mean girl character gets more spotlight. It's almost as if the show is about her and everything in it is revolving around her instead of the main couple (that will break up later but is still the main couple). I basically just don't like anything the writers did this season. It may sound like I'm ranting (which I kinda am, not gonna lie) but its just that I got so attached to the 1 season that it was just so disappointing to see what they did to the second one. I mean like COME ON. They should have left Yeon-doo and Hyun-ho together. I'm not asking for much here lol.