You see drastic changes among characters whereas others seem to never change. It gets frustrating. Fortunately, it is only 12 episodes therefore there is not much room for filler.
I think the first season did Ajin justice, but this season was off. The ending felt sloppy and not properly executed. I'm really not sure what direction they were trying to take Ajin in. The one thing they did a good job about is the soundtrack as well as the fights.
