Set in a fictional Historical world of Maelstrom kingdom, where Demons and Dark Magic coexist, Cheng is the third son of King Osvaldo who is possessed by a demon and that resulted to him having Dark Magic. He's feared by everyone in the palace, because he tends to destroy or kill anyone due to the demon inside of him. Cheng is hated by everyone living in the palace and they always keep their distance from him. He has no friends, neither bodyguards or maids, Cuz they were too scared to serve him. Tatiana is a young lady who is determine to enter into the palace to reunite her friendship with Cheng. But what happens when she succeeded in entering the palace as a servant and she finds out that the boy she knew from years back is now a demon who is always tasty for blood?? Will Cheng be able to remember Tatiana who was his first love from childhood days?? When danger strikes, can he be able to fight the demon inside of him, just to protect Tatiana?? Who is responsible for the demon that possessed Cheng??