You can tell just by looking at the name, look at the self-produced grain after Douluo.
In fact, it is just a review and deduction of some settings of Douluo, some of which are private.
Written for fun.
There are ooc.
Special instructions.
A certain fraternity, a single person who has disliked humans for ten thousand years, a monster in Douluo Yi's various daily lives
Mission: Fraternity