Korea has had a long history dating back to 2,333 B.C. Koreans are primarily one ethnic family speaking one language. Sharing distinct physical characteristics, they are believed to be descendants of several Mongol tribes that migrated onto the Korean Peninsula from Central Asia. The population of South Korea is estimated to be 50 million compared to the 25 million in North Korea. Korean cuisine is characterized by a wide variety of meat and fish dishes along with wild greens. Various fermented and preserved food, such as Kimchi are notable for their specific flavour and high nutritional value. Interest in Korea, triggered by the success of leading Korean dramas and popular music, has escalated to include other aspects of Korean culture, such as Hangeul (Korean alphabet), Hansik (Korean food), Hanbok (traditional Korean clothing), Hanok (traditional Korean houses), Hanji (traditional Korean paper), as well as Korean music. The aforementioned six cultural symbols are collectively referred to as the "Han Style".