This paper is to introduce assorted features of a four-week English Immersion Program managed by Hongik English Language Institute for the first time in summer 2000. The program was aimed to provide English learners with the English simulation environment where everything was supposed to be English only. Thus being exposed exclusively to the English surroundings the clock around, the learners who had not had enough opportunities to use the language were able to attain a high motivation for speaking English, which eventually led to the increase of their general English language proficiency. Presenting merits and demerits of the curriculum and the overall management of the program, this paper plays a role in directing the program in a more improved way for the future and giving guidelines to other institutes where similar programs are under consideration.