Influenced by the Korean Wave, many young people started watching K-dramas and learning Korean.
Tips
memory
韩流 sounds exactly like 寒流 'cold wave', and the name plays on it: Korean dramas and pop music swept in like a sudden cold front.
culture
Coined by Chinese-language media in the late 1990s, the word was taken up in Korea itself, where the same characters are read Hallyu. It covers 韩剧 'K-dramas', K-pop, fashion and beauty products.