I looked up on spoilers, and it seems the manhwa is different from the novel. Apparently in the novel, Mia didn't become a jealous bitch over the emperor and pretty much maintain a good relationship with Leanna. However, in the manhwa, she did try to go after the emperor and became a total bitch. I think she still ends up with the green hair guy in both, though, and Leanna ended up with the emperor.
.
I looked up on spoilers, and it seems the manhwa is different from the novel. Apparently in the novel, Mia didn't become a jealous bitch over the emperor and pretty much maintain a good relationship with Leanna. However, in the manhwa, she did try to go after the emperor and became a total bitch. I think she still ends up with the green hair guy in both, though, and Leanna ended up with the emperor.