Now why did they cut the han vs guk scene from the manhwa...

if you mean the choking scene another commenter talked about, it's might be bc of the sensitivity regarding choking, with good reason. people that choke/strangle their partner are 750% more likely to murder their partner within the year. at least in my county, i'm not sure what the statistics are in other countries. so it's definitely something to not normalize. not that the producers said this is why, but that's my hunch.