so basically siyue's mum is the da furen (the main 1st official wife) and shiya's mum who WAS a qieshin/concubine got promoted to secondary wife so while she is an official wife she ranks below the da furen. like if we bein historically accurate n throwing out the drama them shiya's mum could never rise above that. but for this dramatic webtoon since siyue's mum was poisoned/"sickly" he handed the power over to his qieshin (before shiya got title and promotion) so ho was going around acting like the zheng furen/official hostess of the household and upon the promotion she thought her ass was rly gonna be able to off siyue n her mum and become the legit da furen. much lols. and yeah the court rank thing; no matter your position in the household if you gain a court rank from the emperor that basically trumps anyone without a title or with a lower title

Can someone explain ranking in this manhua, its so complicated. MC is the oldest daughter of official wife and is ranked first. Lian Shiya who was only a daughter of a concubine, who although favored was not an official wife, so she was ranked low. Now Shiya was promoted to third ranked lady and started to pull rank on MC. But MC is still ranked first, still above her, so why does Shiya demands MC bow to her. Even if MC does not take her seriously, other ladies do and go "Shiya is a noble now, so MC should bow to her." How come?