Which south asian, southeast asian, or east asian country do you believe has had the greatest success in meeting the needs of its people since world war ii? why?

South Asian country: India.
Most countries today acknowledge that India could provide a good quality of tech workers with a cheap price.

Southeast Asian Country: Singapore
Singaporean people always placed on top 10 in the order of countries with highest standard of living in the world

East Asian country: South Korea
It's a close race between south Korea and Japan. But currently, all countries in Asia look toward south Korea as their cultural and economic model.