Traveling Between Two Worlds: Zhu Yuanzhang Becomes My Employee

[Travel Between Two Worlds + Conquer the Realm + Build a Power Base + History + Urban] Chen Feng is tricked by his girlfriend into going to Honduras, a small Central American country with the world's highest crime rate. The strange stone his grandfather left him is accidentally activated, sending him to the late Yuan dynasty. He discovers that the stone is actually a World-Crossing Stone, allowing him to travel back and forth between the ancient and modern worlds. So he brings AK-47s, tanks, and artillery from the modern world into the past to conquer the realm. Even Zhu Yuanzhang ends up working for him. He transports oil, rare earths, lithium, and other mineral resources from the ancient world to modern times, along with antiques such as porcelain, jade, and gold objects. He amasses wealth, builds his power, and becomes the ruler of Honduras. Even the world-dominating Eagle Nation regards him with trepidation. With the World-Crossing Stone, he easily manipulates both the ancient and modern worlds in the palm of his hand...