The same Mongols and Manchus that murdered tens of millions of Chinese men, women and children. The same northern nomads who ruled China for several centuries and ruthlessly subjugated your people.
Speaking of which, Korea is the same country that killed 302,300 Chinese soldiers in a single battle. The same country that caused the collapse of the unified Sui Chinese dynasty. The same group of people that kicked the Tang out of the peninsula. The same group of people that destroyed the Khitan who conquered the Song dynasty of China. The same group of people who are polluting your country and turning your people into indentured slaves.
Thanks for the +$40 billion dollar surplus each year. And thank you China for allowing us to build polluting factories in your country.