A webtoon background illustration of an empty South Korean school classroom, close-up frontal view. The camera is positioned right in front of the wall, capturing a clean, classic green school chalkboard on the left side of the frame. The chalkboard is completely blank, solid green, with no text, no letters, no chalk drawings, and no inscriptions. The center and right side of the room are completely empty with plain light-beige walls. No teacher podium, no desks in the middle, no people, no students. Only a pure, minimalist, and clean close-up shot of the front of the classroom. The art style must perfectly match the crisp lines, flat color fills, and simple cell shading of the manhwa "High School Conquest" (고교정벌).
