I heard that Korean people cannot be 100% purely Korean, due to the war and the male solders sexually assaulting female Koreans. Although many of the half Korean-Japanese babies were killed, many were kept a secret of being half Korean-Japanese. Also, East Asians tend to have other East Asian ethnicity in them. For example, I am half Japanese and half white, I probably have a small percentage of another East Asian from a part of my Japanese side.
It does not mean anything, unless you want it to.