12 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.
The show draws on a folk belief system where spirits exist in a hierarchy. A 큰 귀신 (keun gwisin, 'great ghost') is a powerful top-level entity, while 잡귀 (jabgwi, 'miscellaneous ghost') are lesser spirits it can command and send into human hosts. Think of it like a general dispatching soldiers — the great ghost stays back while smaller ones do the dirty work of possessing people.
Yoon is reciting the Prayer to Saint Michael (성미카엘 대천사님께), a standard Catholic exorcism-adjacent prayer composed in the 19th century and still widely used by priests in deliverance ministry. Korean Catholic priests performing 구마 (guma, exorcism) rites often open with exactly this prayer, making it immediately recognizable to Korean Catholic viewers.
Yukgwang says '쌍팔년도' (ssangpal nyeon-do), a casual Korean expression meaning 'the year '88' or, more loosely, 'back in the bad old 80s.' It evokes the era of military dictatorship and intense political repression that preceded South Korea's democratization in 1987–88. He's referencing the student democracy movement (학생 운동) when hiding activists from police was a real and dangerous act of solidarity.
Bong-sang cites '형사 소송법 212조,' Article 212 of the Code of Criminal Procedure, which authorizes police to arrest a suspect without a warrant if they reasonably believe the person committed a serious crime and there is no time to obtain one. The arrested person must be told their right to a lawyer and the right to request a legality review (체포 적부심). Korean dramas often have characters recite this precisely to show the arrest is by the book.
Kil-young mentions that Pak Il-do's family built its fortune during the 일제 강점기 (Ilje gangjeomgi), the Japanese colonial period lasting 1910–1945. In contemporary Korea this carries a strong moral shadow: families that prospered under Japanese rule are often labeled 친일파 (collaborators), a deeply shameful designation. The show uses this detail to paint the family as powerful, secretive, and morally compromised long before any supernatural element.
The drama establishes that Pak Il-do gouged out his own right eye before drowning himself, and every person he later possesses re-enacts this same self-destruction. This mirrors real Korean shamanistic lore where a possessing spirit compels its host to replicate the spirit's own death wound, essentially marking the host as 'owned.'
Hong-ju's father calls Pak Il-do his '막냇삼촌' (youngest paternal uncle) and explains that makes Pak Il-do Hong-ju's '작은할아버지' (great-uncle, literally 'small grandfather'). Korean kinship terms are extremely precise about generational distance and birth order within a family line, so these titles instantly communicate exactly how far the shameful branch sits from the main family — close enough to be a secret, far enough to disown.
Gyeyangjin is portrayed as a remote East Sea (동해) coastal village, the place where Pak Il-do walked into the ocean and where the drama's supernatural chain reaction began decades ago. In Korean horror and folk tradition, the sea — especially the cold East Sea — frequently serves as a liminal boundary between the living world and the spirit world, making it a natural setting for a ghost's origin story.
When the possessed father reveals he walked the entire distance to Gyeyangjin overnight without stopping, it echoes a belief found in Korean mudang (무당, shaman) tradition: a spirit fully in control of a body feels no human fatigue or pain, effectively using the host as a vehicle rather than a living person. The worn-out sneakers serve as the show's grounded, visible proof of something that would otherwise be unbelievable.
The grandfather confesses he once told Hwa-pyeong's father to '해하다' (haehada, harm/injure) the child — meaning he instructed his own son to hurt his grandson. In traditional Korean family ethics rooted in Confucian hierarchy, a grandfather's word carries near-absolute authority over the generations below him, making this order almost impossible to refuse and the guilt of it something that would fester for exactly the twenty years the drama shows it did.
With his last breath the grandfather says he wanted to see Hwa-pyeong '장가가다' (jangga gada, get married — literally 'go to the bride's house,' an older expression used specifically for a man getting married). For older Korean men, seeing a grandchild marry is the definitive proof that the family line is secure and one's own life was worthwhile. The phrase lands with particular weight because it is his generation's language, not a young person's.
The possessed father warns that everyone close to Hwa-pyeong — parents, grandparents, the priest, the female detective — will die because of their proximity to him. This mirrors the concept of 살 (sal), a kind of malevolent spiritual energy in Korean folk belief that attaches to a person and spreads harm outward to those around them. Characters who can see or fight spirits are thought to attract particularly dangerous 살.