neither of countries have banned bitcoin,but what they actually banned was initial coin offering knows as ICO, china step had a huge impact on bitcoin but impact due to south korea market barely took notice,but after impact done by china too,bitcoin is again taking a leap in good manner.
all of these are done because south korea fears that cryptocurrency represents a non-productive method of financial speculation. This is a common theme among governments as they approach market regulation. Cryptocurrency is easily conflated with fiat money, but its anonymous, which makes it very difficult to tax.
so no need to panic, created just to create a mess in bitcoin holders mind,bitcoin is still operational.