Plane as an Undead

When I woke up, I was faced with a town filled with smoke comparable to that after a world war, with skeletons as far as the eye could see. QAQ Can anyone tell me what happened? Fortunately, I got a plane store, but who can tell me what I can sell in this undead plane where skeletons are everywhere? To whom? QAQ After finally connecting to the source plane where I am, I find that there are really monsters and the underworld in the world? QAQ It turns out that the world I lived in before was also so unsafe! This article is 1v1, or there is no cp, the male protagonist doesn't know.