When an angel and a demon meet

This starts from a girl who was very innocent and kind. She was very beautiful. People said she was an angel. One day she was going home from Hospital as she was a doctor then suddenly some goons came to her and draged her to a valley and belated her to death. After death she was recarnated in another world. In this world she was only 5 years old and had a beautiful family since she didn't have a family in her past life she enjoyed living with them. In this world devils and humans and she was commoner and humans could use magic too. But not that much it was not much for some reasons she could use extraordinary magic at the age of 17. One day she was using some advanced magic tricks when her parents saw her they became worried that how is this possible. When royals got this news she was called to palace. The royals thought if she a commoner will start using magic then their importance will finish. When she went to the palace the king ordered to execute her they dragged her to the prison. At night she escaped from the prison the guards were running behind trying to catch her. She ran in a forest but as it was in devils territory the guards stopped there. They thought the devils will kill her themselves. After getting out of the forest she passed out. The devil king sensed a human in his territory he asked the guards to bring her to his palace. As they brought her she was unconscious. They locked her in prison. When she woke up she called by the devil. When they brought her Infront of their king she tried to run by using her magic when the demon king saw her use magic he thought she was from the imperial family. He asked are you from the imperial family. She said; no I came here running to save my life because of those imperials I don't know how my parents are now you caught me what you want to kill me too. The devil asked why were they behind you she replied because I could use magic. The devil found her cute. The demon king came to her and picked her in his arms and took her to chamber and said that you will stay here and I will save your parents and you from those imperials. But you will have to marry me. The girl thought for a while and agreed to the deal. The demon king sent some of his soldiers and ordered them to bring her parents here. When they came he gave them food and sent them to their chamber he had just prepared.