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The world war in this book is just a figment of my imagination. Of course, I don't want a world war, because it means chaos and death. With the continuous advancement of human science and technology and the over-exploitation of planetary resources, many countries on the planet will worry about resource issues, and eventually compete for resources, leading to the outbreak of war and plundering the last resources of the planet. War can make science and technology progress, but if a world war breaks out when resources are insufficient, it will be the end of the world. Science and technology will not progress, but will only continue to regress, and the planet will gradually become frozen...

The protagonist is reincarnated into a skeleton. What interesting things will happen to him in a different world with a system?