This paper examines on the process of restructuring in the verbal stem change ``□->맡-``. Syllable final coda ``st`` cluster changed to ``th`` on the orthographic system. The main problem is whether this change is the phonological one or not. Actually, there is no way to explain ``st>th`` on the only phonological change, because this change contains another motivations. Paradigm of verbal stem ``□-`` inferred from paradigm of verbal stem ``□□ -``, and therefore stem``□-`` changed to stem``맡-``. This change based on ``s>t`` process and ``s>t`` process evidently affected the restructuring of underlying form. Especially, the discordance between phonological changes and orthographic changes caused the wrong analysis or led to the various restructuring. On this viewpoint, I try to explain the alternation and restructuring of ``□-, 맛기-``. In fact, the argument about the change of these stems mainly focuses on changes in the phonological system. Up to the present, the restructuring related paradigms rises up as the important issue of phonology and morphology. As you know, ``paradigmatic analogy`` and ``reanalysis`` should be critical facts on the restructuring. Based on this approach, I argue in favor of the paradigmatic analogy on ``□-, 맛기-`` and the related verbal stem. In this case, surface forms of verbal stem are more important than underlying forms. The reason why paradigms are so important for the analogical mechanism is that there are some examples for restructuring hard to explain through the rule mechanism. Nevertheless, the argument about analogical processes and paradigmatic analogy is not examined thoroughly. In this paper, I concentrate on the analogy cross some paradigms related the phonological, morphological and semantic change.