Are Koreans and Mongolians genetically related?

Studies of classic genetic markers of protein and nuclear DNA show that Koreans tend to have a close genetic affinity with Mongolians among northeast Asians (Goedde et al., 1987; Saha and Tay, 1992; Hong et al., 1993).

Are Koreans related to Mongolian?

Mongolians and Koreans are ethnically related peoples cut off by centuries of history. In the 13th century, Mongolians swept across China and down the Korean peninsula, and were on the brink of invading Japan until several naval disasters changed their minds.