Sun Mo, a social animal beater, died suddenly while working overtime and was selected by the system as a test subject for the "Villain Transformation Plan". The moment he was bound to the system, he exchanged souls with the most ferocious and evil monster in the world, the "Fu Yuan" - Sun Mo possessed the monster's terrifying body and overwhelming demonic power, while Yan Yuan, who was so confused that he couldn't even remember his own name, looked confused despite his status as a social beast.
The system assigned him an outrageous mission: maintain the persona of the "evil demon", attack enemies, participate in demon gatherings, and avoid being pursued by the righteous. Every time he completes a task, he can get feedback from the demon power and gradually collect fragmentary clues about his life experience. But Sun Mo gradually discovered that the body of this confused demon actually hid a bunch of deadly secrets, and all the human and demon races around him seemed to be searching for the truth about the "soul exchange".
While he has to play the daily life of a bloodthirsty demon, he also has to battle wits and courage with a confused demon soul who can only nod his head all day long. What's even more difficult is that he discovers that the object of his soul exchange is not just the Abyss - there are more sleeping ancient beings slowly awakening in this world. Sun Mo is determined to change his destiny in the cracks between various forces. Until he finally figured out the true purpose of the system - a catastrophic disaster, waiting for his return...
