The purpose of this research is to document and analyse spatial transformation of an unauthorized dwelling units on a peculiar site of Seoul. It's physically attached to the behind part of the west boundary wall of Chang-Duk Palace. These dwelling units took not only the site, the narrow street which had been a stream, but also the two parallel walls of others for their home. The two walls, one from the palace wall and the other from the wall of a house which distanced itself from the palace wall about 3.5 m for the reason of the Cultural Properties Protection Law, have been held as the main structural members in forming the shelter. With examining the realm of time which provide the base of the spatial realm, this research shows how the multiple linkages tangled in an illegal shack did gain and actualize an architectural language of idiosyncrasy with spontaneous order inherent in inhabitants.