Come here Sang Won, I'm going to tell you the story of your Great Grandfather's, Great Grandfather.
Your Great Great Great Great Grandfather was named Lee Oh. He was a merchant during the TANG DYNASTY. He was one of the wealthier traders because he sold GUNPOWDER and other materials such as PORCELAIN and Spices.
I love Gunpowder.
Your Great Great Great Great grandfather traded with several people in his hometown. But he made the most profit when he traded with the Japanese. He traded many innovated materials such as the COMPASS, and he passed along BUDDHISM and he also made his traders pay TRIBUTE to China