From How your job is killing you by James Adonis in the Sydney Morning Herald (I try to avoid giving free publicity to companies, but I’ve got to credit my sources):
The Japanese have a word, karōshi, to describe people who work themselves to death. … In China the word used is guolaosi. … South Korea, too, has a term for this pervasive condition: gwarosa.
A little bit of linguistic knowledge shows that those are actually the same word, in the pronunciation systems of those three languages. Japanese and Korean have borrowed a large number of words directly from Chinese, and have also created new words themselves from Chinese characters.