13 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.
South Korea abolished statutes of limitations for murder in 2015, but the abolition only applies to crimes committed after that date. Because this case happened roughly 20 years earlier, the old rules still apply — the clock has already run out on prosecution, even if the killer is found. This is a real and painful legal gap that has affected many cold cases in Korea.
The chief's warning that touching someone powerful means 'losing your uniform' (옷 벗다, literally 'take off your clothes') is a well-understood shorthand in Korean workplaces: you will be forced to resign. The phrase carries the full weight of social shame that comes with losing a government position in a culture where stable public-sector jobs are deeply valued.
PC방 are dedicated gaming cafés found on almost every Korean block, often open 24 hours. They are a hugely popular hangout for teens precisely because they are cheap, social, and hard for parents to monitor. A parish priest using them as a comedic foil — kids skipping Bible study for PC bang — is an instantly relatable setup for Korean viewers.
아재 (ajeossi-lite) is Gen-Z slang for an out-of-touch middle-aged man — roughly 'total boomer.' 핵노잼 (haek-no-jaem) literally means 'nuclear no-fun,' an intensified form of saying something is completely boring. The kids are playfully roasting the priest for using jokes that landed in a different decade.
In Korean Catholicism, as in many conservative communities, being known as a 독실한 신자 (dogsil-han siinja — 'devout believer') who attends Mass regularly carries strong social credibility. The priest cites it almost as an alibi, because the idea of a genuine churchgoer being capable of serious evil is deeply counterintuitive to him.
The grandmother explains that Hyeonju had a hearing impairment, which makes the school's 'she ran away' excuse especially implausible to the family. In 1990s Korea, students with disabilities often had very limited support networks; the victim's isolation — one friend, no outside contacts — reflects how little infrastructure existed for hearing-impaired students at ordinary schools.
Jjamppong is a fiery Korean-Chinese noodle soup loaded with seafood and vegetables. 삼선 (samson) means 'three fresh ingredients' — a mix of premium seafood — making it the upgraded, more expensive version. Ordering it as compensation for a favour is a well-worn Korean workplace ritual: food is the universal currency for smoothing things over between colleagues.
모가지 literally means 'neck' and is blunt, informal slang for getting fired or forced out — the image being that your head gets cut off. Bong-sang uses it to stress that pursuing a sitting 국회의원 (gukhoe uiwon, National Assembly member) is not just career-risky but career-ending; elected lawmakers in Korea enjoy significant legal protections that make police investigation extremely difficult without the legislature's cooperation.
Private schools in Korea are typically owned and run by a 학교법인 (school foundation). The 이사장 is the chairman of that foundation's board, making them the ultimate authority over the school — above the principal. A student who is the foundation chairman's daughter effectively has no one in the institution who can or will discipline her, which is exactly the dynamic Mi-jin describes.
Catholic tradition distinguishes between 빙의 (byingui — ordinary demonic attachment or oppression) and full possession, where the demon wholly controls body and soul. The priest explains that a fully possessed person can endure crosses, holy water, and Scripture without reacting — they can fake normalcy — which is why the usual exorcism red flags do not trigger. This distinction between 'obsession' and 'possession' is part of actual Church exorcism protocol.
In the Catholic Church, a priest cannot perform a formal exorcism without written permission from his bishop — called 'faculties.' If those faculties are revoked, any exorcism he performs is canonically invalid. Yun reveals his were stripped after the Kim Yunhui incident, putting him in a bind: Church law forbids him to act, but people are dying.
나눔의 손 means 'Hands of Sharing.' Korean civil society has thousands of such faith-based 재단 (foundations) that donate to hospitals, orphanages, and community programs — often under a church umbrella. The detail that the foundation sponsors the psychiatric hospital where the witness is held tightens the web of control the show is building around the politician; donors to such institutions often have informal influence over staffing and patient access.
The drama establishes that Bak Il-do's original human body lost sight in one eye, and that this physical mark carries over to every person he possesses. Hwapyeong checks Bak Hongju's right eye as a literal identity test — the equivalent of a supernatural fingerprint. This kind of bodily stigmata passed between host bodies draws on Korean mudang (shamanic) lore about spirits leaving physical traces on the people they inhabit.