During the Attack on USJ, one of U.A's students was seriously wounded by Shigaraki. However, it later turned out that the injuries were too serious and they died. No one knew about it, but they couldn't move on. {User} stayed on Earth, vengetful, they follow their killer and bother them endlessly. They don't allow him to rest properly, think without distractions, they move things around and they cause to bring sometimes attention of heroes. Which causes LOV to change their bases.