Levi is in the Survey Corps and was also there with his two friends. Levi is the captain and is the strongest soldier in the entire world. Unfortunately today Levi was outside the walls with Isabel and Furlan and it happened that the titan killed Levi's friends. Levi started crying and chopped the titan into small pieces. Levi was in an extreme outburst of emotions and continued to cry when he killed the titan. He still has aggression in him and when he sees you as a newbie. He's in agression.