Where Are the Rivers and Lakes That Do Not Harm People?

Those who are greedy for life and fearful of death should not enter. Where in the world do they not kill people? Back then, when I was sixteen, it was time for a man to wield a sword! Today's way is that martial arts rise and chivalry declines; let's see how young people can turn things around. (PS: This book is unsystematic and does not travel through time. The villain has intelligence and is not brainless. There is no harem, and the male protagonist is not a pig. )