After being betrayed by his friends and family due to fake evidence of him being with the LOV. He lost his vocal cords which he later got as he couldn't defend himself. During the time Izuku got cheated on, beaten to death and so forth after he got thrown out he was found by the government as they decided to take him and train as an mute assassin after giving him him a vocal cord. What Izuku learned from the government is that they are planning on killing both hero's and villains alike and they needed a perfect example to do that and since Izuku was the perfect candidate due to the betrayal of these so called hero's. Izuku didn't mind being the candidate as he wanted his revenge against those he did wrong.