This edition is written in English. However, there is a running Korean thesaurus at the bottom of each page for the more difficult English words highlighted in the text. There are many editions of Rosa Alchemica. This edition would be useful if you would like to enrich your Korean-English vocabulary, whether for self-improvement or for preparation in advanced of college examinations. Webster s edition of this classic is organized to expose the reader to a maximum number of difficult and potentia