Sebyeonggwan was built in 1604 by Yi Gyeong-jun, the 6th Commander of the Naval Force, who moved the command post to this area. For about 290 years since its establishment, the building served as a naval force headquarters of three provinces. After several renovation works, it still commands its old-time majesty as one of the most grandiose local government buildings overlooking the South Sea. Sebyeonggwan is a majestic one-story building with nine rooms in front and five rooms on the sides. It features exotic roofing called paljak jibung, a hip and gable roof whose curved eaves lead to corners going upwards. The whole structure has a wooden floor on the ground, which is raised about 45cm higher at the center to display royal tablets. Right above the altar stands a red gate with spiked tops. The lower part of the cornice is wainscoted to have a sliding door, while the upper part is finished with a stripe of wood featuring a painting of soldiers, and the ceiling is paneled. As a one-story wooden structure constructed in the early 17th Century, Sebyeonggwan is one of the largest historic buildings, along with Gyeonghoeru Pavilion in Gyeongbokgung Palace in Seoul and Jinnamgwan Hall in Yeosu. Its academic and artistic value is highly appreciated together with those of Jinnamgwan Hall.