I don't think there'll be a harem. Are you even in the hundred chapter? They only admire Joshua and Joshua didn't even think of romance even once. I thought at first it too that there'll be harem but it is very clear that there is none. They're all just passing women in his life. It might be Icarus the white hair or silver? Yeah, it might be him or no one if ever Joshua is going to have a partner.
But right now tho, Joshua is so focused on his revenge and the romance might be just side stories.
I know what you mean. There are 2 kinds of harems--
Type 1....
Where the male mc literally salivates after females and has multiple relations with almost all of them. Like he's sampling all the flavours of candies. So this male mc will either marry everyone of them and all these females will accept that situation like it's normal.
Type 2....
Where the male mc plays aloof. But all the females salivate over him. Mooning and longing for him. And let's not forget those pointless panels where they are shown to be jealous. ( ̄へ ̄)
And to my knowledge almost all the authors will put in a dialogue for the male mc, where he says "why is she acting like that?", "what was that about?" ┑( ̄Д  ̄)┍ .
But it doesn't end there. This male mc will end up with this unearthly beauty, so feminine and the author will use her as a standard to let all the other salivating females know that she is the standard for our heroic male mc(⊙…⊙ )
Idk which type is worse but we are clearly dealing with a variant of the second type.
The early chapters was pretty good but sucks in the later ch plus the potential harem in this manhwa