To go from the discord to the collaboration of the studies of language, literature and culture, we have to know what is their interrelation. It may be: (a) language <literature <culture. (b) We must endeavor to extend the study of language to the study of literature, the study of literature to the study of culture. (c) The study of language itself must be developed into study of literature, the study of literature itself must be developed into the study of culture.
(a) means that "language+x=literature, literature+y=culture". x can be enumerated as music, fine arts, philosophy, religion and history etc. But y is hard to be clarified. (b)'s proposition "must endeavor" can be an irresponsible demand, without leading by example. (c)'s proposition "itself must be developed into" can be proved in actual activities of research.
I selected (c). Using a sijo work by An Min Young, a famous poet of the late nineteenth century, as a typical example, I tried a case study. I verified that to explain the whole range of linguistic usage, the study of language itself must be developed into study of literature. I also attested the fact that, by same reason, the study of literature itself must be developed into the study of culture, to know the wider and inner meaning of the literary work.