I also thought that maybe Guwon was protecting Teach from something else regarding his father. Either Teach killing him, or his father attacking him in some way (by being turned into a zombie or smth more sinister) and Guwon saving him.
However, I always saw this as cope, because Guwon wasn't shown to be very empathetic, and his fall for Teach was not on sight, but gradual. So he had no reason to protect him.
I really hope it's something like that . I would enjoy seeing a decay of Teach's morals, but I also hope they can at least be a little happy together

Why do I lowkey feel like teach killed his own father? Or maybe I forgot something that was mentioned. As far as I remember, teach isn't actually sure that Guwon killed his father, it's more like a made-up memory.