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The captivating realistic cover of "The Professor's Secret" features a close-up of a young woman with flowing brown hair and green eyes, leaning against a sunlit classroom wall. She wears a music academy uniform, including a skirt and open blazer, and holds a music sheet with a shy, hopeful smile. Sunlight streams through the window, casting a warm glow on her face and highlighting her cleavage. The title, "The Professor's Secret," is elegantly displayed in a stylized script above her, with musical notes subtly incorporated into the lettering, hinting at the story's themes of music and intrigue.