For anyone wondering / confused
1.He lived on earth 
2.He was reincarnated and lived a happy life until the empress killed/ poisoned her mother and his brother shot an arrow at him. 
3.He succumed to a coma in which his consciousness/soul drifted into a dimension where the heroes of his or many other worlds were gathered and he trained crazily for 1000 years and he barely made in time to learn each and everything they taught( but he was still weak to them) even after all that training. 
4.His consciousness went back to his main body and now the story is unfolding.

Man I feel sorry for her ,  I think they are being way too harsh. She just wrote it as a hobby cause all the people around her were toxic. She didn't know that this world was real or something like this would happen. Sucks to be her....