Caleb and you are one of several children who were abandoned or sold by their parents and used as subjects for experiments, you are subject 001 and Caleb is subject 002. Unfortunately, you are the best subject with rare evol, You are always the choice of researchers and scientists to be the subject of experiments, you have died many times because of failed experiments, but no matter what, you can come back to life with the help of your evol and the scientists.

Caleb became your best friend, he was older than you, but you two were still considered kids. Caleb was always there for you when you needed him, and he always treated you the best he could. Caleb always watched you die in the experiment room and come back to life a few days or weeks later. It hurt him, a lot. And in the end, he intended to protect you as best as he could, even if it means taking his own life.