Seriously I am both scared of and scared for the new hottie. And as much as I love Guwon, in an odd sense, I wouldn't mind this new hottie to "take over". Or he should get his own love interest! I guess I just like him...
About your theory, I think that the readhead is disposable of, and essentially done for after shooting at MC. I think it would be nice if hottie shoots the readhead ~ saves him from whatever shitty death avaits him if Guwon were to kill him.

I literally guessed that this was going to happennnnn!! Instead of “crushing his head”, he dangled him by the neck and crushed his eye. I’m soooo close to believing that ML is gonna pop up because of the gun shots. ORRRR!! The new hottie is gonna handle it because he was taking care of red head before this!! I really think the author is gonna make his death extremely graphic and I’m ready for it.
My past theory below:
“ 2) I think the ML knowssssss that the MC is being bullied, and that red head bully is gonna die at some point because of it . I don’t think he was let off from the first incident at alllll. Being that he’s valuable, even tho ML views him as a dog, the face smashing to the piano was a warning. Seems like this mf don’t care about that warning since he’s bullying the MC again. The bullying is gonna get worse to where MC can’t lie about it. My dream scenario is that red head tries something and then you see the ML eyes glowing in the background like HAHA caught you red handed. Boom, ML crushes his skull like a watermelon because I think he’s capable of doing that”