Geungnakbojeon Hall, the oldest surviving building at Muwisa Temple, was built in 1430 (the 12th year of King Sejong) and designated National Treasure No. 13 in 1962. But the value of this building isn't limited to the architecture itself. On the wall behind the altar is an Amitabha Triad mural, depicting the Amitabha Buddha at the center flanked by the bodhisattvas Avalokiteshvara and Kshitigarbha, with six arhat figures and two manifestation buddhas painted amid clouds above. The composition and style are relatively simple, but the mural's execution is considered exceptionally refined.
The clue that revealed the mural's creation date turned up unexpectedly. During a restoration in 1956, an inked inscription was discovered on the wall reading roughly "completed in the third month of the byeongsin year, the twelfth [reign year]" — evidence that has led scholars to date the mural to 1476, the 7th year of King Seongjong's reign — later than the building itself. In other words, the mural was added to a hall that had already stood since 1430, and the two National Treasures have occupied the same spot together ever since. In recognition of this value, the mural was separately designated National Treasure No. 313 in 2009. It's rare for a single, modest worship hall to hold two separate National Treasures side by side — one architectural, one a painting.