Lost Korean esoteric book
Koguryŏ pigi (Korean: ; Hanja: ) is a theorized Korean prophetic book that predicted the downfall of the Korean state Goguryeo. The book is attested to in other records, although it is some uncertainty that it exists. Its contents are mostly unknown; all that is known of it is that it predicted Goguryeo's downfall within a 900 years by an 80-year-old military commander.
References.
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Kim Hong-jik 金弘稙, “Goguryeo bigi go 高句麗秘記考” [A study of the ‘secret record of Goguryeo’]. "Hanguk godaesa yeongu" 韓國高代史硏究 (Seoul: Singu munhwasa, 1971).