Slice Of Life In Fantasy World

Liam was reincarnated into a world where 100 year's ago Reiki recovery was started. Here strong can do anything, rules are only for weak. At the beginning with him was a System, and he choose to be a villain at the beginning.Even though he could be a protagonist and even could live his life as a ordinary person why did he still choose villain at the beginning. Is it really his an simple choice or was there a fate in the dark.if want to know then simply dive into the story.