Alright, so my country's webtoon publisher (kinda like tappytoon) picked this up and released a whooping 30 chapters tomorrow and after reading so far I think this is very much like Abandoned Empress, albeit a more mature and less... dramatic? dramafull?
While art-wise the Abandoned Empress is more elaborate and like 'wah' but I think this one got more world-building? They're both still pretty vague in explaining the kingdoms though, at least the toon versions.