He is the most ruthless person in this fairy world, but he only treats her tenderly. She knew from the beginning that there would be no good outcome for them, just because he was an immortal and she was just a mortal. For the obsession in her heart, she decided to practice and become an immortal, instead of being plotted against or degenerated into a demon. If he saves her, he will no longer be the master of this fairy world. If he doesn't save her, she will become his biggest enemy.