I only have one free afternoon in Korea. Should I spend it learning makeup?

Spend it on the lesson if you want the afternoon to still be on your face at dinner. A viewpoint is over when you leave. The class keeps paying you for the rest of the day, because you are wearing what you just learned.

One afternoon has to earn its place

Short trips force a cruel choice. The makeup lesson earns it when you care how you look in the hours after, not only during the activity. RihaKim Makeup is built for that: about an hour, or about 40 minutes for eyes and brows, then you go back out.

When to skip it

Skip it if you want a landmark and nothing else from the day. Book it if the trip already has sights and what is missing is you, looking like you meant to be in them. That is a real trade, and for a lot of visitors the lesson wins.