In 2025, Liu Li, a doctor of military industry, traveled through the occupied area in 1937. He became a down-and-out scholar who was hunted down by a special high school class, but he had a "black technology system" in his mind - but the system version 1.0 Could only unlock improved blueprints for civilian electrical appliances.
Without a submachine gun, he built a "high-voltage electric mosquito swatter" to electrocute the puppet army patrols; without a radio, he assembled an "ore radio monitoring network."
Female agent Hu Jing suspected that he was a spy and tested him step by step. The Japanese secret service "Ju Agency" has laid a dragnet.
When the system reaches 5.0, Can he use 21st century thinking to rewrite the outcome of the entire war?
