I'm Working on Infrastructure in the North

An arrow pierced the heart, and the red crystal shattered. When Qin Zheng opened his eyes again, there was a memory in his mind that was not his own. A college student in the 21st century, a damn northern state, a fantasy from an exiled prince to the common ruler of the world. He is the eighth prince of the Zhaoqin Kingdom, Prince Ning, who was demoted to the far north and will never return! But the North came to life in his "memory": blast furnaces were erected, incense drifted thousands of miles away, heroes bowed their heads, the old dynasty fell, strange ghosts were decapitated, and the sacred tree reappeared! Until the woman in red put a knife on his neck. "Hey, Your Majesty, you said you would work with me to create a world where wizards are free. Do you really mean that?" "Why, why! You want to lie to me? This is hell! Thief Qin, suffer death!" Is this throne room real or a dream?