They say the reason the mountain behind Jeonggong-dan (altar) in Jwacheon-dong is called Jeung-san is that it has the shape of an earthenware rice steamer (Jeung means ‘steamer’, and san means ‘mountain’). In February, 1593, one year after the Imjinwaeran (Japanese Invasion of Korea) broke out, Japanese general Mori Terumoto built this fortress using the stones of Busanjin-seong, which had been demolished by the Japanese army after its capture. The Dong-gu office has operated it as a sports park since 1982.