Korea was once the Roman Empire of Asia.
Koreans today claim that they are pure-blooded race.
However, the root of Koreans come from Northeast Mongolia and Manchuria, and from the Siberians.
The Kaoli tribes, one of the Mongol's horse-riding tribes moved to the Korean peninsula and were intimidated by the Natives living in Mahahn, Byunhahn, Jinhahn.
They shared almost the same culture and language.
Later on Koreans built the mighty Koguryo Empire which was a big threat to the Chinese and the Huns and even Japan was once under Korea's dominance.
This strong Empire lasted for 907 years followed by three native Korean kingdoms (Baekjae, Shilla, and Kaya) .
These days the Chinese insist that Koguryo was one of their ancient countries but the way historians and archaeologists see it, there are so many evidence that Koguryo was a Korean Empire.