The librarian is dressed as a loser in cultivation, but he has his own [Earth Civilization Database]. When others were practicing spiritual energy, he was preparing chemical equations beside the alchemy furnace; when others were flying in the sky with swords, he was building psychic jets. Many years later, the battle between immortals and demons was filled with smoke, and the enemy troops were approaching. Lin Fan took out a trumpet and said, "Fellow Taoist, please stay - have you heard of the cultivation youth version of 'Two-Directional Foil'?"
Intention: time travel