Reincarnated as a Monster in an Evil Sect with System

Eleven ran a business, wasn't extremely poor but neither too rich. Earn everything in his life by himself, from scratch. Lived his life, fulfilled all his dreams, had a beautiful wife, two daughters and finally had four grandchildren. He died smiling, having no regrets, at the age of 83. After what felt like an eternity long sleep, opened his eyes and found out he was a monster! And not a monster in a jungle but in an evil sect of Beast Tamers!