I Have a Magical Otherworld

When Qin Rulong opens a closet door, he discovers a portal to a magical otherworld—and becomes its revolutionary overlord. Armed with Earth's technological knowledge, he transforms magic into devastating weaponry: Magic Gatling Guns, Magic Laser Rifles, and the terrifying 'Magic Little Boy' capable of leveling cities. While the inhabitants worship him as Lord Dragon, the genius inventor of miraculous magical devices, Qin insists it's just science. But when steam billows and magic bullets fly, does the distinction even matter?