I wanted to know the ntr is just the protagonist catching married women or will he also be betrayed?

No dude (I didn't planned but you gave me a solid idea If she betrays mc gender equality comes in)

NTR here is Netori where mc cucks other man and NO woman in mc harem will willing fully wants to fuck other man 

there might be a weak charatcer in harem gets kidnapped and those guys wants to fuck her but mc saves teh day before they put in or even kiss 

So far the story I wrote mc is this power house and wants that piece of woman in his journey 

even if woman betray mc I will kill her but so far I didn't go that way