I Handed over the Double Door and Died Tragically, I Was Reborn to Dominate Both Worlds

[Double portal + Monster world + Modern technology martial arts + Management of two worlds + Decisive killing + No female protagonist] In the last life, Chu Zhou accidentally awakened to the double portal and immediately chose to hand it over to the country. However, what he was waiting for was not reuse, but imprisonment and cruel experiments by the Wang family in Kyoto. Before his death, Chu Zhou detonated the research institute and died with his enemies. When he opened his eyes again, he went back to the day he called the police. "Sir, what do you want to hand over?" Chu Zhou hung up the phone decisively. In this life, he took out loans to stock up on goods, went overseas to buy weapons, and stepped alone into the Daqian Dynasty where demons were rampant. There is a shortage of food and medicine in this other world, and modern supplies are worth thousands of gold. There is no supernatural power in modern times, but the other world is full of skills, demon blood, elixirs and gold. Others took demon blood and narrowly escaped death, becoming monsters. However, Chu Zhou established a biological company, used modern technology to purify demon blood, analyze martial arts, quantify martial arts, and let the entire modern civilization practice for him! Sell ​​gold, develop strengthening fluids, establish strongholds in other worlds, and cultivate warrior legions. While others were still fighting for a few drops of demon blood, Chu Zhou had already established a huge force spanning the two worlds. In my last life, you used me as a guinea pig. In this life, I will monopolize the double portal, level the two worlds, and make all betrayers pay with their blood!