hmm.. i don't know exactly what to tell you because the differences are really subtle (usually), but i guess i could give you a few pointers. ok, so first off, japanese people usually have darker eyebrows and their look is more sharp and angular than korean people (at least that's what i think xD). also, japanese people usually have darker hair color (unless they've died their hair). a lot of korean people don't have black black hair. some korean people naturally have a red tint in their hair. i, for example, have dark brown hair that may look black when inside a room, but looks brown/gold ish when standing out in the sun. oh gosh... such a long explanation and i don't think it was even helpful. xD