There are two groups within the population possessing exceptional abilities: those who use their powers for evil, driven by immoral desires, and psykers, who use their skills to uphold justice and confront their adversaries. Cassian Lee, a powerful psyker known for his kind nature, journeys to Greece to visit a friend, unaware that this trip will change his destiny. Unexpected events transpire, and Cassian is suddenly stuck in the body of a Korean high school student who has turned into a villain. Will Cassian's moral values prevail, or will he give in to a heartless and brutal mindset?