This kind of power is complicated, because many powerful parents in the country send their daughters to the harem in exchange for help and power... He ends up being forced to have a relationship with many women in exchange for power. Unless he changes that but in reality it wouldn't make much sense ╮( ̄▽ ̄)╭
spoilers on older comments ive heard:
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he marries her only. ofc there is going to be conflict and other women trying to get with kainer and more drama to come but dont worry he stays faithful till the end so yea he never cheats on her. ngl he WAS a playboy in the past so he did sleep with many women BEFORE he met saye but after she saved him, she was the only women he saw. i like the ML, he's not that bad considering this is smut with a plot, he's a decent ML
i get what u mean but something like him being forced to bed other women and have many children would probably not happen in this manhwa. while other women may force themselves onto him, this one is too warm-hearted and less realistic for smth like that to happen. it doesn’t really fit the narrative i feel

What irritates me about this kind of story is knowing that he has to sleep with other women in the harem to have heirs. Well I hope he changes that, he seems so in love with her and only her