I recently started watching Squad 38, and to my delight, Kim Sung Oh made a cameo appearance in episode 2. This got me thinking of how much I love cameos. This stems all the way back to when I was a kid and watching the Muppet Movie and the Great Muppet Caper, etc, which are full of wonderful cameos. This probably makes me appreciate all the lovely cameos in K-dramas as well.
So I made a list of all the cameos that I especially loved, and some that even made me watch the drama just so I could see the cameo, which is pretty much the most ridiculous thing ever.