As someone who couldn't sing, dance, play the piano, or do anything else obviously impressive in front of a crowd, I was secretly a little bit proud of my random mini-talent, and so I cultivated it by reading all kinds of reviews for movies I never saw and memorizing the names of random bit actors.
The IMDB app on my phone has made my offhand ability to answer the question of "What else was that guy in?" somewhat obsolete, but I still have some affection for those side actors who appear in everything without anyone (ad by "anyone," I mostly just mean me) knowing anything about them. I used to read the "Lawrence/Julie&Julia" blog from time to time, and he would occasionally spotlight random actors from Julie and Julia. I've decided that I want to do the same thing here, but with kdrama actors who pop up frequently in side roles. Because why should you have to Google things if I can Google them for you?
For the first kdrama edition of "Who's That Actor?", I'm going to spotlight Lee Sung Min: