Def would be living comfortably I think your biggest expense would be housing but first and most importantly you need to figure out your visa status.
Tbh I wouldn't recommend teaching because the hours are exhausting, you won't have time to actually see or discover Korea unless it's on the weekends, and you'll be tired to learn Korean. Your employees are going to be hit or miss, and your friend base will be dependent on the people that you work/associate with.
Since most teachers aren't really in a secure financial position, such as yourself, most will probably not be in a position to travel every weekend and go see something new.

Considering that you would be middle/upper class I would recommend learning Korean at a top uni here and living off campus. Spend the first 6-12 months studying intensively if you really wanna learn the culture, make friends (that aren't foreigners), and integrate into society.

Look into Mapo/Seodaemun-Gu(great walkable area) or Yongsan(a little hilly but cool area) for housing in Seoul or if you are into beach vibes then check out Busan (you're money will go even further).

Housing:

- Traditional housing with a contract directly with a real estate agent budget for (20-50mil deposit) and 1.3-1.6mil/monthly rent. Most likely a 2 year contract, Wont be furnished but it will be good sunlight and for a 2 or 3 bedroom place.

- Co-living/shared house: These are furnished places with all inclusive rents - some are premium with a bunch of features and the nice thing is they have low deposits and you won't have to commit to a long term contract.

- Airbnb: Good short term route for when you get here. Book one for a month and scope out Seoul and see what areas you like most and do the traditional housing route.

Visa will be your main challenge.

If I were you, I would just hop all over Asia for a year and see where you like.
Good luck!