After eighteen years of ordinary life, what would you do if you suddenly found yourself in the world of *Harry Potter*? For Eisen, the answer was simple: blend in. He thought it would be best to become a low-key professor at Hogwarts, just another face in the crowd, teaching students with minimal attention. Nothing too flashy. But then, you ask about the "System"—that mysterious power that grants extraordinary abilities. Eisen chuckled. "System? Sure, it’s useful, but it’s not enough to make me Invincible instantly," he said, brushing it off. Still, deep down, he knew that with this unique power, his life might not stay so quiet for long. To read up to 30 chapters ahead: Patreon.com/writer999. . Translated with major modifications and deletion of toxins and racism.