This was an enjoyable second season. The pacing was good but slower in episodes. 2 -3).
Many people are saying this was a filler season, but I disagree. This was a build-up season, and for me, it worked well. I want to watch season 3.

The story will continue to season 3, I hope we can get more from the new characters. The one point I disliked was how badly the rebellion was planned, I wish we could have seen more before the end of the season.

The new cast did well overall - I liked Park Sung Hoon's performance the most, Yuri, Siwan and the mother did amazing too.
I didn't enjoy T.O.P performance too much, sometimes it was too over the top.

The music did work well was season one, some of the choices did generate the right vibe.

I will probably watch one more time since I binge-watched it. I want to catch more details.