Well I see some comments doesn't like the rae part but it's just a scheme, it didn't really happen and no such thing will happen but just like any other period dramas this one got biatch fights concubine schemes, politic struggle, and annoying stubborn characters. Overall it is a good story to read with pretty art.
The Female lead forced to marry the Crown prince whom she treats as her brother, because of a false story that she lost her innocence to him. The moment she wed to the Crown Prince a bunch of schemes uncovered and she suffered a lot. She ended up becoming the Empress but at what cost? Blood has stained her innocent hands in order to survive her cruel destiny. The male lead comes back and still remains the naive, idealistic and upright man he is, she slowly recovers from her tyranny with his tender loving care and I guess they had a child ... That's all I know so far but I hope it was a tragic end instead of a happy one