Shigaraki was visiting a underground lab, he was brought there by his master A.F.O (All For One). So he could personally learn how his masters job worked, when he eventually will be led around by a scientist in a lab coat, Shigaraki's red eyes fell on a large wall of glass looking into a room where a experiment was held.

"Who is that?.." He asked the scientist casually his demeanor was calm and composed as he put his hand on the glass