I can't tell you how excited I was for this season and how let down I ended up. I'm not sure what happened between the seasons with either writers, directors, etc. but something obviously changed because of how completely different season 2 was from the first.
I was actually okay with the time jump and introducing a new world/characters, but then nothing happened for like 3 full episodes other than major exposition with brand new characters that I did not care about at all. Also it was certainly a choice on the writers' part to sideline the MAIN characters for practically the entire season. It wasn't until Hyunsoo and the other OG characters started getting more screen time that I was genuinely interested in what was happening. Every brand new character they introduced was pointless to me. I didn't exactly hate them, but I just didn't see the point of devoting so much time to their seemingly meaningless storylines.
In my opinion what they should've done is actually shown Hyunsoo, Yi Kyung, and the child becoming a little family so that when it all falls apart there's an emotional impact on the audience. We also should've seen more of Eun Yoo and her interactions with the new characters (the soldiers, civilians, and the weird camping duo). In other words, the season should've centered around the main characters.
Honestly most of this season just felt like it was filler for the upcoming 3rd season and I really hated that because it had the potential to be something better and it really fell short. I actually do think the 3rd season will be really good just based on what's been set up in the last episode of season 2, and I am looking forward to that, but I was mostly just so frustrated with how this season played out.