I bet the red hair guy shot the other person because he was about to push the MC just like the was imagining, the red hair guy probably realized how important the existence of MC to Guwon and protected him the way Guwon would just to get on their good/twisted side.
I bet the red hair guy shot the other person because he was about to push the MC just like the was imagining, the red hair guy probably realized how important the existence of MC to Guwon and protected him the way Guwon would just to get on their good/twisted side.