The Gyuwon sahwa (Korean: 규원사화) is a forged text from the early twentieth century, claiming to be a history written in 1675 that describes ancient Korean history.

[1] In 2017, South Korean historian Cho In-sung writes: "The debate over authenticity [of the Gyuwon sahwa] may be said to be already over...

"[2] Evidence for the Gyuwon sahwa's lack of authenticity includes:[3] The work was probably compiled by a new religious movement that involved the worship of Dangun.

[4] On the Gyuwon sahwa, historian Don Baker also notes that "there are indications that the author of this purported seventeenth-century manuscript was aware of the creation story found in the Genesis chapter of the Bible and was also familiar with the Christian beliefs in the trinitarian nature of God and in the immortality of the human soul.

"[5] The book consists of five parts: Prologue (揆園史話序), Jopan-gi (肇判記), Taesigi (太始記), Dangun-gi (檀君記), and Epilogue (漫說).