8 timestamped notes explaining the Korean cultural context in this episode — customs, idioms, food, honorifics, and history, at the moment each appears on screen. These notes discuss events across the whole episode. To see them revealed scene-by-scene as you watch, use the episode page to find an airing.
A 눌림굿 (nullim-gut) is a shamanistic rite performed to press down or suppress a spirit already inside someone, buying time without fully expelling it. 굿 (gut) is the general term for a full shamanic ceremony in Korean folk religion. The ritual requires periodic renewal; when its power runs out, the spirit regains full strength — which is the crisis unfolding for Hwa-pyeong's grandfather.
Bong-sang notes that the victim apparently died by suicide in full view of police officers, yet the recording proves he was murdered. In Korea, cases officially ruled 자살 (jassal, suicide) are extremely difficult to reopen once filed, because suicide findings close the investigative file quickly and shift the matter to the family. This is why the ruling is so damaging to Gil-yeong — she pushed for a murder investigation and lost.
계양진 (Gyeyangjin) is the fictional coastal county where much of the drama is set. 덕령 마을 (Deongnyeong Village) is described as the most 낙후된 (nakutdoen, underdeveloped/neglected) part of it — a rural backwater where a Catholic charity mission would naturally concentrate its work. Neglected villages like this recur in Korean horror because they sit outside the social safety nets of city life.
팔문금쇄진 (Palmun Geumswaejin, 'Eight-Gate Golden-Lock Formation') and 팔문진경 (Palmun Jinggyeong, 'Eight-Gate True Scripture') are drawn from Korean and Chinese Taoist-shamanistic tradition. The 'eight gates' refer to directional barriers used to contain supernatural forces. In practice, performing them requires years of training — which is why Yuk-gwang says this cannot be done overnight.
The care-worker cuts her own fingers repeatedly while muttering about money and resentment. The show frames this as demonic influence amplifying her existing despair until it tips into self-injury — a pattern the drama has used before to show how Park Il-do exploits a person's darkest inner thoughts. If these feelings resonate with you, the Korea Suicide and Crisis Hotline is available 24 hours at 1393.
Yun's private prayer asking for strength to endure until the end and to be received by God afterwards is structured like an Act of Contrition combined with a petition — forms familiar from the Roman Rite that Korean Catholics use in the same Latin-derived liturgy. The emotional weight is amplified for a Korean audience because Catholic priests in Korea are highly respected figures, and a priest openly preparing for his own death is a profound image.
요양원 (yoyangwon) are long-term care facilities for elderly or chronically ill patients, distinct from acute hospitals. South Korea has seen rapid growth of small, privately-run rural care homes as its population ages, and many operate on thin margins — exactly as the director here describes. An isolated, cash-strapped facility with few visitors is a realistic and quietly sinister setting.
The possessed officer's speech — promising to break doors, sever heads, drink blood, and 'swallow the living' — echoes the stylised language of Korean gut (shamanic ceremony) in which a hostile spirit announces itself and demands appeasement. The phrase '죽은 자는 산 자 위에 있느니라' ('the dead stand above the living') inverts the normal ancestor-veneration belief that the dead watch over and protect the living, making it explicitly threatening.