The Great Song's Deposed Crown Prince Attacks Goryeo and Forces the Koreans to Change Their Name

I was just visiting the ancient city of Kaifeng, and somehow I ended up transmigrating. Worse, I’ve become Zhao Yuanzuo, the eldest son of Emperor Taizong of Song. I’m facing the prospect of being stripped of my title and reduced to a commoner, with the position of Crown Prince slipping out of reach. There’s no helping it. At least I arrived in time. I can’t become Crown Prince just yet, but I can take the initiative and stop things from getting worse, so I don’t end up stripped of my title and locked away for more than ten years, as I was in history. Fortunately, I have the System. I immediately draw Lu Bing, history’s greatest commander of the Embroidered Uniform Guard, and manage to avert disaster by taking up a post in the provinces. I arrive on the Shandong Peninsula and become military governor of the Zhenhai Army, building up the navy. While developing the economy, I keep raising troops in huge numbers. The fleet sets out on its first campaign, intending to attack Liaodong, but takes a wrong turn and ends up in Goryeo instead. What? This is Goryeo? What the hell does Goguryeo have to do with those Koreans? Then let’s take the fight to them. We have to change the country’s name.