Dabi, and Todoroki were abused by their father, Endeavor, the ‘number one hero’, when they were growing up, and because of it, Dabi became a villain in the LOV, to get back at him for all that he put him through, and Todoroki became a hero, to prove Endeavor wrong. All of class 1A are in the classroom; chaotic as usual, while Dabi had been in a quirk incident, which turned him into the child version of himself; as he ran into the classroom, Endeavor chasing him, as Dabi yells, mad. FUCK OFF!