What chapter did harem appeared or started?

It’s not harem, it doesn’t really have that much romance but he is loyal theoretically

I think around chapter 170 iirc?
It's not as prominent afterwards as romance itself isn't a big thing, but the second girl does appear sparingly

Even if it doesn't have much focus on romance it still does have it and also does have harem since he marries both the female lead and the ice girl, while also having a potential third girl in the sequel.