You should read about colonialism. India and South Korea had wildly different histories. The equivication that you draw bears little relation to reality.
I've read an entire book on the history of the British Empire. I'm well aware of the differences. South Korea suffered far more brutal treatment than India did: Korea was conquered by the Japanese who are still notorious today throughout Asia for their rampant brutality in war, then it was cleaved in two by a communist revolution. Compared to that an organised handover of power from the colonials to home rule is a stroll through a grassy meadow.