Seonjeongjeon Hall is where kings worked and discussed state affairs with their subjects. Seonjeongjeon is a small one-story building composed of 3-kan(a unit of measurement referring to the distance between two columns) front space and 3-kan side space. Although it was used as the king's office, the queen occasionally held events here along with the king. During the reign of King Seongjong, his queen threw parties for the elderly and held events to promote sericulture in the hall. There is no partition wall between the columns of the building, so one can never feel a sense of stuffiness here. The ceiling is decorated with dancheong (various designs painted in bright colors). Seonjeongjeon is the only remaining royal building that has a roof of blue glazed tiles though several other palace buildings had been roofed with such tiles before the Japanese Invasion of Korea in 1592. The tiles are similar to those produced in Ganghwado Island by Buddhist Monk Yugyeon. With its unique roof tiles and other building materials relatively well-preserved, Seonjeongjeon Hall is of great value in the study of mid-Joseon architecture.