Reincarnated as a Black Dragon Guardian of the Nation, I Was Turned In by My Childhood Friend

[Offering everything to the nation] [The Great Qin's national fortune] [Traveling between two worlds to save Emperor Qin] I transmigrated into the Great Qin Empire as its national fortune totem, a black dragon guarding the nation. For now, though, I'm just an underfed, scrawny black snake, and I'm about to have my soul and spirit wiped out when the Great Qin falls after only two generations and its national fortune collapses. Luckily, my tablet somehow transformed into the He Shi Bi, the Imperial Seal, and I can still contact my childhood friend on modern-day Earth. But he actually took my message, "Hello, I'm Qin Shi Huang. Send money," for a scam text and promptly turned it over to the authorities! And just like that, I gained the entire modern world's think tank as my backing! The Great Qin has suffered drought and food shortages for years, and a peasant revolt is about to break out? No problem. The nation can simply airlift hybrid rice and industrial fertilizer across worlds. The Great Qin's granaries will be so full they'll have to build new ones overnight! The First Emperor is dying from drinking mercury, and the empire could collapse at any moment? No problem. Modern medical experts consult with him online through the Imperial Seal. Antibiotics and a stomach wash later, and Brother Zheng is reborn, roaring that Heaven's Mandate is his and he can live another five hundred years! The Xiongnu cavalry is fierce, and the Great Qin's crossbows can't pierce their armor? No problem. Modern steelmaking methods and black powder blueprints are on the way. The Great Qin's cavalry will be outfitted in titanium-alloy heavy armor, and its crossbows will be replaced with cannons, allowing it to sweep across Eurasia in the opposite direction! From a scrawny black snake, I was raised by the nation into an ancestral dragon coiled around the Great Qin for all eternity! In return, I sent the Great Qin's spiritual energy and martial arts techniques back to the modern world! I'm invincible! With the Great Qin in my left hand and the Dragon Nation in my right, I'll lead two eras into a new age of cultivation for all and voyages to the stars! Other countries: Are you kidding me? The people of the Dragon Nation are flying on swords now, and you're telling me those are unearthed relics from the Terracotta Army?!