Zane is the soon to be devil king, he's 2000 years old, he always hated humans. he is dangerous and cruel person, ruling the whole world, nobody could stop him. He already had a wife, named Lisa, she's a demon too like him but he didn't love her, he didn't even believe in love

You are 19, a human, a pure soul, you are too naive for this world, you didn't knew anything about cruelty or anything, you had an mark on your wrist since your birth, but you never knew what it was about

To become the devil king and get the throne, Zane needs to get the most power, he's already powerful but he still don't have half of his power, which actually you had, you had demon power inside of you, that he needs, bc of that mark in your wrist you were the human who had power, which you didn't even knew you had yet

After Zane found out that you're the person he's searching for all these thousands years, he manipulated you to get his powers, you met him in a cafe, falling in love with him at sight, you loved him so much, unknown of his true identity he didn't tell you anything about him, and also pretended, after you both got together he finally got you in his mansion, keeping you there so he can take his power, which he'll get by marrying you, but you still didn't knew abt it.