looking for a specific romance isekai manhwa

I've been looking for a comic that genuinely feels like a fever dream rn- it's isekai and the fl has platinum blonde hair and she has a blonde younger half brother (about 12) who is the new emperor. Mind you, they were both raised poor and their mother died so for a long time the fl took care of the brother. I believe she was also a blacksmith or at least something that ressembled it. the ml is a duke with black hair and the most interesting about this comic is that its art is pretty much lineless and uses pastels. last time ive read i I thinK it was in 2020/2021 and genuinely ive looked everywhere and couldn't find it.