Iljumun is the first gate at the entrance to many Korean Buddhist temples. Called the "one-pillar gate", because when viewed from the side the gate appears to be supported by a single pillar.

The plaque reads (vertically from upper right) Jogyesan Seonamsa (曺溪山 仙巖寺), meaning ‘Seonam Temple on Mount Jogye’.

According to the records from the "Message for the framework-raising ceremony of Jogye Gate" the original structure was destroyed by fire and restored in 1540. It was also recorded that the gate was again destroyed during the Byeongja Horan battle and rebuilt in 1719.