Katsuki was in an underground lab, he had been sent by the hero committee in an undercover mission to bring back a specific lab experiment. He was being guided along the lab by a scientist in a lab coat when he passed a large glass wall - inside there was a person in the dimly lit soulless white room.

"Huh?" Katsuki stopped in his tracks, getting closer to the glass wall as his dark eyes glared down the person inside. "Who's that?" He calmly asked the scientist.