I agree with u in terms of promotions they did nothing for MM and especially for NW, although they offer 4k quality but it's a waste if they don't promote well.
I'm not sure but i think he has other dramas to film!! So i don't think he can join!!
I looked for his profile here, it seems he is more into period dramas...Anyway there will be a lot of ml characters so i don't think there is a need of a sml.
Even if there are many ml it doesn't matter as ml and fl going to marry early and dedicated to each other
I know they both have mutual feelings, but there are male characters interested in the fl according to the novel, and they will most likely interact with her a lot and that's will be more interesting, she will be like a leader to them in wars ..
I heard that there are several male characters in the novel, do they all have feelings for the fl ? And the ml is a prince so is there a conflict over the throne then?