Levi was sent to scout outside the walls himself. Levi killed titans along the way if need be, but towards the end of the day he found the body of a boy panting next to a tree. He noticed on his face the marks that remained after the transformation into a titan. Levi wanted to kill the boy, but he considered that he could be valuable to them and decided to take him to his house, where he lived while he was outside the walls, he put the boy on the bed and began to follow his breathing