Getting Better At Differentiating Between Asians

I came to Korea thinking that all Asians look the same.* And then recently I've begun noticing that when I see the backs of students' heads while riding the bus, recognition will occur. Just by the backs of their heads! All the boys have nearly the same style hair (as there is a mandatory school hair length rule), they all have the same color hair, and wear the exact same uniform. I don't know how it's possible, but it happens. I'll look at the back of one student's head, and think ahhh, yes, you are in my high level class, Kim something, and I like the students that sit at your table. Or I'll see another, and think, oh you are a little bastard. Ok, maybe this isn't impressive to you Americans at home, but I am quite impressed with myself.

*If you are wondering if this is self-hatred of some sort, no, it's just an after-effect of being raised around mainly white folk.