Lee, Jinsung. 2014. A Study of College Students' Malpractice in Korean Orthography: a Follow-up Study with a Special Emphasis on the Influence of Chatting Language. The Sociolinguistic Journal of Korea 22(3). This study is a follow-up study of Lee's(2001) “A study of malpractice of orthography among Korean college students-with a special emphasis on the influence of chatting language”. Within the similar research framework, Some malpractice of orthography in current college students' essays were compared with those of Lee's. The aim of this study, therefore, is to find out how, in what aspects and extents, the influence of chatting language on formal written language has manifested different characteristics after a span of 13 years. Regardless of the drastically increased use of chatting language these days, most of its characterizing features were found to be significantly declined in current students' essays, compared with Lee's(2001). Expressions or vocabularies mainly suitable for spoken colloquial language, however, were observed to be adopted much more frequently and freely in formal written essays. This study additionally investigated the Korean orthography rules on separating words, which were not dealt in Lee's. Violations relating to separating words were found to be seriously grave, which can be considered as a direct negative influence of general writing practice of chatting language, where the rules are routinely ignored chiefly for the economy of space and time.