While I don't dispute that South Korea had amazing growth, was it really faster than "every" other country? How does it compare to Japan? Or Australia?
Japan was a developed country with one of the strongest economy in the world before WWII. They showed a crazy rate of economical growth right after WWII, but I think it was more of a recovery rather than development.
Mostly faster than Japan or Australia, although the crown for highest GDP growth in a single year goes to Rwanda for growing 35% in 1995 after shrinking by 50% the year before.