I think he is aware that there is something between Josh and Chase.
Grayson is pretty sharp. He also knew that Yeonwoo and Keith were in love years before they knew, because of him even Keith half-siblings knew before Keith.lol And we're talking about someone who has problems understanding emotions.
And as strange it might sound for most manhwa readers, Grayson cares for Chase in his own messed up way. So that is most likely the reason why he doesn't do anything to Josh. Josh, as badass he might be, would have no chance against Grayson if he got serious.
Yea that could be the case...if grayson got serious the one who could control him is dane or dom omega by his pheromones even dane can't match him in physical strength lol
I actually found it funny how Josh and Dane initially underestimated Grayson, because of their military background. While Grayson is most likely one of the most dangerous dominant alphas in that universe.lol
I am kinda wondering why did grayson's self defence did not activate..mf goes berserk after saying it's for self defence whenever someone hurts him physically lol...may be he was confused??