If not for this imperial edict, he would not have become His Majesty's trusted aide today. No one knows how it was supposedly a case of stealing someone's love, when someone merely sought the Princess Royal's help because they didn't want to offend him. But he hated her with all his heart.
The layout is a bit dense. It will look better if it is divided into more sections and separated.
In the copywriting, "But he hated him." Is it her?