I Want to Save a Country, but It Lived a Hundred Thousand Years Ago

"Your name is Nannan, right?" "Yes." "I come from a hundred thousand years in the future." "?" "The human race will be extinct in one hundred thousand years." "?!" "I will teach you the skills on the condition that you bury what you have learned throughout your life in a place after your death." "Okay." Su Yu traveled through time and became the last human being in the world. Looking at the ruins and devastated world, he thought he would die soon. Until he had a dream, in which he came to a hundred thousand years ago... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.