Overview
The 8th Night is a 2021 South Korean mystery-thriller film directed by Kim Tae-hyoung for Gom Pictures starring Lee Sung-min, Park Hae-joon, Kim Yoo-jung, and Nam Da-reum. The film depicts the struggle of a former exorcist attempting to stop the resurrection of two mysterious beings who tormented humans and were locked up in separate caskets for 2500 years. It was released on Netflix and made available for streaming in 190 countries on July 2, 2021.
Plot
"A man, who was once an exorcist, suffers until he faces a demon that is freed. The night exists between real and unreal, their struggle to stop the resurrection of the demon has begun!"
About two and half millennium ago (2,500 years), a monster crossed the bridge from hell to the human realm to create human suffering. Buddha ripped both the Red Eye and the Black Eye from the monster and locked them inside different Śarīra caskets. Before the Red Eye surrendered to Buddha, it ran away for seven days by hiding inside human bodies. On the 8th day, the Red Eye looked back. Knowing that it could not escape Buddha, it surrendered itself. The Eyes were buried in the cliffs of the Far East and the desert of the Far West. Buddha instructed his disciples to make sure they would never meet.
In the present, Professor Kim Joon-Cheol (Choi Jin-ho) sets out in the desert to prove the existence of the Śarīra caskets. He finds a relic which is presumed to be one of the caskets. However, the scientific community declares his findings to be fraudulent, and he is shunned by all. Fourteen years later, Professor Kim, now a bitter individual, is determined to prove the truth of his discovery by reuniting the Black Eye and Red Eye. He opens the casket and pours six vials of blood into it along with his own. Before Professor Kim is about to give up, the Red Eye emerges from the casket, presumably possessing Professor Kim.
From Wikipedia (CC BY-SA 4.0).