It's very unoriginal, I personally don't really enjoy it. It's your usual fantasy world where the MC was a soldier, had a tragic life and then regresses to back when he was an infant and then the manga is about him preventing tragedies he went through in his past life (like saving his village from a stampede) I personally lost interest in this story when the MC said he "likes" Karen (who is like 8 years old), idk if he meant romantically but he replied that he likes Karen whilst blushing when his father asked if he likes anyone .-. (he is an adult mentally) It's a verygeneric setup I've seen several times before, the start is basically identical to "The Strongest Savior's Second Chance"