The horrifying things Sebastian experienced in the first game left him scarred, but rather than run from the source of his nightmares, Sebastian chased after them.
https://youtu.be/sjdVg9gZfzg?list=PLSHdOA4o6T_dh3R-AOk-BHpOeZydzUY4e
He spent three years seeking answers to the questions that plagued him and trying to find the organization who ruined his life. Who is Mobius? What do they want? What is the true purpose of STEM?