Villain to Kill

A brief description of the manhwa Villain to Kill:

Cassian was executed by colleagues for falsely accusing him of murdering his friend. When he died he thought it was all … his life had come to an end.

But suddenly, his soul moved into the body of a schoolboy.

“You must become a great evil to fight the real evil!”

A top-class Psyker decides to stop being a hero and steps into the path of a villain.