No One Told Me That This Place Was Prehistoric.

A modern person travels back to the Three Sovereigns and Five Emperors period and originally thought that he could only invent some small things to improve the quality of life. Suddenly one day he was told that this was a prehistoric period, so a botched inventor appeared. With a large number of inventions benefiting mankind, many inventions were attached with merit. Suddenly one day the inventor disappeared, and the magic weapon of merit caused a small chaos. At this time, what should you do with modern memory? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.