This is the first time I heard about supervision fees. I searched further and it seems this is the norm in other businesses too but I'm a bit confused as to why exchanges/business need to pay the supervision body to supervise their activity. What's the rationale? Some articles mention that this can be regarded as tax, but why would you name it differently? Sounds really odd if you're looking from the business POV.
Anyway, it seems like they will only request payment from an exchange that has more than 3 billion won of operating revenue, which probably means small exchanges won't be affected. Even if they operate on losses, those big exchanges probably will have enough funds to turn the situation around next year or so. If not, I guess that means the market decided they aren't good enough for them. CMIIW.