Why September
Autumn begins — Chuseok. Near-perfect weather; expect company at the headline sights.
Weather 80 Crowds 55 Autumn begins — Chuseok
VisaTourist visa required for Indians (K-ETA / embassy) — verify current rules.
12-month outlook
Hansa packed an umbrella. Every stop in your plan gets a Google Places match and a working map link before you see it.