I read the novel.
Well, Suirei is Shisui's sister, but they aren't biological related.
It's a part of political move by Shisui's father to protect his wife who's taken by previous empress dowager to the previous emperor.
Suirei is the previous emperor daughter from lower consort.
All the older maid in the consort palace is the previous emperor's consort.
They work at the palace, so that they didn't have to be buried next to the previous emperor.
And remember how most palace maid is came to the palace because they get kidnapped or sold by their parents? To help those children get educated, and learn skill to work at noble house, so they encourage parents to sent those children to the palace.
That is also a deal made by Shisui's father.
Yes, he loved his actual wife very much. But after his wife is taken off him, he do everything he can to appease the previous empress dowager to get his wife back. But the abuse and trauma the wife experience in the palace and the fact that the previous empress dowager force the father to take another consort (Suirei's mom) and Suirei as wife and daughter, broke the wife's mentally.
So, he let the wife do everything she wants even if it meant that he took the blame of it.
In the end, he even died for her.
In one chapter in the novel, he became the most loyal husband.
(╯°Д °)╯╧╧ is Suirei dressed like a guy? Or is she actually a he?? Or is this her brother??? And is Shisui Suirei’s younger sister??????