An Airbnb revenue forecast is a month-by-month projection of occupancy, ADR and revenue for one property, set beside comparable listings. Buyers use it to test a purchase, operators use it to check an arbitrage lease, and hosts use it to set targets for a live listing.
What I plan around in Seoul: Cherry blossom and autumn foliage seasons; K-pop concerts and fan tourism; Chuseok and Lunar New Year; Business and medical travel. Guests I price for: Asian and Western travellers on 3 to 5 night stays in Hongdae, Gangnam and Myeongdong. Where I start: Seasonal and concert premiums, and compliance with Korea's foreigner-only rental licence rules.
On Airbnb, Agoda and Booking.com I set up PriceLabs or Wheelhouse with seasonal profiles, event overrides for big concerts and a clear rule for how quickly rates move when tour dates are announced. I also check that your licence details and house rules match on every channel.
The service in general is described on my airbnb revenue forecast page; this page covers how I apply it in Seoul.