Which 2001 South Korean romantic comedy, based on a series of online love letters, became a blockbuster across East Asia, was a big hit in Japan and Taiwan, and by 2006 was the best-selling Korean DVD in Japan?

Question

Accepted Answer

My Sassy Girl. My Sassy Girl became a blockbuster across East Asia, a big hit in Japan, Taiwan and Hong Kong, and by 2006 it was the best-selling Korean DVD in Japan.