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In this paper, examine how his Juri theoretical thinking developed in neo-confucianism, focusing on the contents of the insimdosim and sadanchiljung among Hwaseo's Ligi and simsung theory, and confirm that these Juri theoretical thinking leads to the theoretical basis of his saving the country practice.
Above all, Hwaseo emphasizes Li's uniqueness that does not mix with Gi. Li's an independent positionition as the leader and presiding over the Gi is secured only when speaks only Li without mixing it with Gi, which leads to thinking such as Lisun-Gihu, Lijon-Gibi, Liju-Giyeug, and Risun-Giak, and at the same time, it also develops in simsung theories such as his insimdosim and sadanchiljung.
In the end, Hwaseo's Juri theoretical thinking provided an important theoretical basis for realizing the active participation of confucian scholars during an urgent period when the political situation demanded the implementation of the salvation.