Which Asian country had the greatest influence on Korean political institutions?

China had the greatest influence on Korean political institutions throughout history. This influence can be traced back to the adoption of Confucianism, which shaped Korea's governance, social hierarchy, and cultural values. The tributary relationship between Korea and China also facilitated the importation of Chinese bureaucratic systems, legal codes, and administrative practices, which were adapted to suit Korean contexts. As a result, many aspects of Korea's political structure reflect Chinese models, especially during the Joseon Dynasty.