She was an "evil breed" who was hated and ignored by her father. She ran away from home because she resented her father. In order to get revenge on her father, she was willing to sacrifice her life's happiness; he was a proud son of heaven, a royal relative, but he had an unknown sorrow. When he and she met, the same feeling brought them closer and closer, but they were injured completely.
The two people were too similar and refused to completely trust the same person. When they were finally willing to let go of their guard and try to trust, they were still hurt more deeply in the end...