It was also known as the Ok-dang (옥당, 玉堂), Ok-seo (옥서, 玉署), and Yeong-gak (영각, 瀛閣).
It also served as a research institute in the study of Confucian philosophy and to answer the king's questions.
Its officials took part in the daily lessons called gyeongyeon (경연), in which they discussed history and Confucian philosophy with the king.
Gyeongyeons generally took place three times a day although few kings such as Taejong and Yeonsangun abolished them.
Since these discussions often led to commentary on current political issues, its officials had significant influence as advisors.