IMO South Korea has been Westernized much more than Japan or China.
Even before South Korea came under U.S. influence, Buddhism in Korea has been weaker than in Japan for a long while because neo-Confucianism took over as the state ideology in the early 15th century. Neo-Confucianism emphasizes going out into the world and contributing to the public good, not withdrawing into a hermitage. Most of the great Buddhist monks that people remember are from before the switch. Buddhism was often actively suppressed, and tolerated at best, for the last 600 years.
Even before South Korea came under U.S. influence, Buddhism in Korea has been weaker than in Japan for a long while because neo-Confucianism took over as the state ideology in the early 15th century. Neo-Confucianism emphasizes going out into the world and contributing to the public good, not withdrawing into a hermitage. Most of the great Buddhist monks that people remember are from before the switch. Buddhism was often actively suppressed, and tolerated at best, for the last 600 years.