Jukseoru is a pavilion building located in 44 Jukseoru-gil, Samcheok-si, Gangwon-do. Jukseoru is characterized by the fact that the center 5 bays out of the front 7 bays are in the form of Jusimpo, while the ends of each side are in the form of an Ikgong. In addition, the columns are not aligned with each other because the columns of both compartments are out of the center rather than the columns of the center of the five compartments of the columns do not match each other. Based on this, architectural historical circles initially built five bays in pairs, but later added one space to each side to make it seven bays. Recently, however, a new claim has been made that it was built with seven bays from the beginning. Therefore, this paper proved that Jukseoru were expanded through historical data. We also looked at the characteristics of the Jukseoru period and the process of transformation through comparison of the bracket type.