The greatest serial killer in the world

A novel talks about a man who was working in assassination and mercenaries. While he was in his car, he was in a traffic accident. Then he was taken from the accident to a strange laboratory. That was a strange laboratory that was conducting research on humans. This was a dangerous organization that made crazy things, and one of their manufactures was a time machine. While Sinon was there, a time machine malfunctioned and returned everyone to the religion's past. They were in a laboratory. Here begins Simon's journey to uncover the truth about his return in time and take revenge on the organization that destroyed his life.