I'm not liking how jinwoo's been moving I'm ngl. Bro is a side character in his own story.

I don't think he's acting as a side character, rather, the perspective the story is being told in has shifted. In the first season, most event we saw were through his eyes.

Now, with the arrival of the hounds, and the reveal of how things are run, the world is opening up. We are being shown events he has no business being a part of, so that's why it FEELS like he is not doing a whole lot.

The story is no longer about a Teach's and Guwon's love story (that has very much SHATTERED ), but about the town''s rebellion against Guwon and the hounds.