
As far as I understand, omegas can be marked but they are able to have other partners while marked Alphas can only be partnered with the Omega who marked them. According to Kiss me Liar when Yeonwoo tried to hurt Keith, he told Keith that he (Yeonwoo) will be Keith's last Omega while Keith is not Yeonwoo's last Alpha. All this to say....it is very confusing...lol

I think is mostly tied to the Omega's feelings, or maybe their memories(?) because in the side story of KML Yeonwoo loses his memory and the mark Keith gave him disappeared. So I think maybe since Joshua still has some feelings towards Chase his mark remains there or it could be that since he remembers very clearly the night they spent together...idk...it's confusing, lol
I thought Alphas in this omegaverse can't mark omegas? I'm Keith throwing a fit over not being able to mark Yeowoo...
But now Chase can mark Joshua?
Can some clarify this for me? I am blanking out info #-.-)