The Paper Door of Terror

When Su Yang opened his eyes, he was faced with a pure white ceiling. He didn't sit up immediately, but maintained an extremely calm posture—hands flat at his sides, breathing steady, pupils slowly scanning the white expanse above. Three seconds later, he confirmed one thing: the white of this ceiling was not paint, not latex, but a material he had never seen before, with no texture on the surface, smooth as if solidified from liquid, and the edges showed no gaps where they met the walls. This was not normal.