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.
A 풍어제 (pungeonje) is a shamanistic sea-blessing ceremony held by coastal fishing communities to pray for a big catch and safe voyages. Villages along Korea's east coast have performed these rites for centuries, combining music, offerings, and a shaman's prayers to the sea gods. The banners, drums, and torches you see here are all standard features of the ceremony.
The uncle explains that 박일도 (Bakil-do) is a possessing spirit nicknamed '손' (son), literally meaning 'hand' but used in old Korean as a polite word for 'guest' or 'visitor' — the same root as 손님 (sonnim, guest). Calling a dangerous spirit a 'guest' is a traditional way of speaking carefully around it, so you don't provoke it by naming it directly. This word choice gives the drama its title, The Guest.
Korean shamanism has two main lineages. 세습무 (seseupmu) are hereditary shamans: the gift and the role pass through the family bloodline, so Hwapyeong's grandmother and grandfather are already part of a shaman family. This is different from 강신무 (gangsinmu), shamans who receive their powers through a sudden divine possession. The family's matter-of-fact attitude toward Hwapyeong seeing ghosts makes more sense once you know they come from this tradition.
The shaman lists the types of spirits she is driving out: 혼귀 (hongwi, souls of the dead), 잡귀 (japgwi, miscellaneous wandering spirits), 객귀 (gaekgwi, spirits of those who died away from home), and 사살귀 (sasalgwi, spirits connected to violent death). In Korean folk belief each category of ghost has a different cause and must be addressed by name to be expelled. The shaman's threat to boil their bones in a cauldron is a standard formula of intimidation used in these rites.
구마 (guma) is the Korean term for exorcism, and 구마 사제 (guma saje) is a priest officially trained and authorized to perform it. The Catholic Church in Korea, as elsewhere, requires evidence — specific physical and spiritual signs — before sanctioning a formal rite of exorcism. Father Yang's insistence on 'proof' and 'no reaction to the Bible or crucifix' reflects exactly this official protocol, which is why the family's frustration with him feels so real.
사납금 (sanapgeum) is the fixed daily fee a taxi driver must pay to the company before any of the day's remaining fares become personal income. It's a major source of stress for Korean cab drivers and a well-known part of taxi culture. Being called 신삥 (sinbbang, slang for a rookie) and being asked about the quota right away is typical hazing in a taxi garage.
신기 (singi) literally means 'divine energy' and refers to an inborn sensitivity to spirits — the ability to see, hear, or feel things from the other world. Hwapyeong uses the word casually to explain himself to the passenger, framing his gift as something almost everyone in Korea has heard of, even if they don't believe in it. It's a concept familiar enough that it lands as a half-joke, half-warning.
When Yukgwang announces that '광이 여섯 개' (six lights), he is reading Hwapyeong's character using the traditional Korean concept of 관상 (gwansang), face-reading. The theatrical insult — predicting a life of debauchery ending in disgrace — is a stock performance style of street fortune-tellers and theatrical shamans, meant to show off their ability to see straight through a person. Hwapyeong's unfazed reaction tells us the two know each other well.
The victim ran a 용역 (yongnyeok) service company — a labor subcontracting firm that supplies workers to larger businesses for dirty or dangerous jobs. The injured worker is 계약직 (gyeyakjik), a fixed-term contract employee with no job security and almost no legal protection if hurt on the job. The situation the widow describes — the 원청 (wonchang, main contractor) and subcontractor both denying responsibility — is a real and widely discussed problem in Korean society that drives strong audience sympathy.
The forensics report finds salt water — 바닷물 (badatmul) — on a body found near a freshwater reservoir far from the coast. The detectives treat this as a baffling physical anomaly, but Korean viewers steeped in the drama's mythology will immediately connect it to the title card from the opening: the thing comes from the eastern sea (동쪽 바다). The seawater is the show's first hard overlap between the police procedural and the supernatural storyline.
빙의 (bingui) means a spirit taking over a living person's body. The drama uses several classic folk indicators to signal that Youngsoo has been possessed: he speaks in a strange distorted voice, makes threats that sound nothing like him, scratches his own skin raw, and drinks water compulsively. The compulsive water-drinking is a specific detail from Korean shamanistic lore — water is associated with the sea-spirit that has crossed into the human world.
Father Yoon uses the Catholic term 부마자 (bumaja), from the Latin 'daemoniacus,' to describe someone who is fully and genuinely possessed by a demon — as distinct from someone who is mentally ill, faking, or under a lesser spiritual influence. His insistence on confirming this status before acting mirrors real Catholic exorcism procedure: rushing in without confirmation is considered spiritually dangerous to the priest. The scene places all three investigators — the shaman, the detective, and the priest — in the same frame for the first time.