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.
고생했어 (gosaeghasseo) literally means 'you worked hard' or 'you've been through a lot.' In Korea it's the standard thing to say to a mother right after she gives birth — the equivalent of 'you did it' or 'well done.' It's used far more widely than English 'good job,' covering any difficult shared ordeal.
The phrase 누가 한서준 2세 아니랄까 봐 — 'who wouldn't say this is Han Seo-jun the Second' — is a common Korean way of saying a child is the spitting image of a parent. Koreans often tack '2세' (the Second / second generation) onto a famous person's name as a joking compliment about resemblance.
순경 (sun-gyeong) is the lowest commissioned rank in the Korean National Police Agency, roughly equivalent to a patrol officer or constable. Above it come 경장, 경사, 경위, and so on. Barm being a 순경 underlines how junior he is — which makes his role in the case all the more remarkable to the public.
Korean hospitals have strict no-animals rules as a hygiene standard. The fact that the director makes a special exception for Barm's dog is a signal of just how much of a national hero Barm has become — ordinary rules are being bent out of public goodwill and media pressure.
The doctor mentions the 해마 (haema — 'seahorse,' the Korean name for the hippocampus), which sits just inside the temporal lobe. Damage there is well known to cause anterograde and retrograde amnesia. Korean medical dramas frequently use anatomically accurate terminology like this, and audiences generally follow along without needing it simplified.
강덕수 received a reduced sentence through 주치의 감형, which broadly refers to a sentence reduction granted during the prison term — in the Korean system this can come through good behaviour, age, or health grounds. The word '복역 중' means he served his time inside; his release after ten years of a longer original sentence is why the neighbourhood is on edge.
South Korea holds a direct presidential election every five years and the president is limited to a single term. The broadcast announces the official start of the 제20대 대선 (the 20th presidential election) campaign period — Korean law sets a strict, short window for formal campaigning. The drama ties the serial-murder fallout directly to real-style election-season politics.
총명탕 (chongmyeongtang) is a traditional Korean herbal medicine decoction whose name literally means 'clear-minded soup.' It typically contains ingredients like석창포, 원지, and 복령, and is given to students before exams or to people recovering from illness to sharpen focus and memory. Offering it to Barm on his first day back is both practical and affectionate.
At Korean weddings the 사회자 (sahoe-ja) is the emcee who guides the whole ceremony — announcing the order of proceedings, introducing family members, and keeping the mood up. It's an honoured role usually given to a close friend of the couple, so Barm being asked is a mark of real friendship, even though he protests he's not up to it.
This insult riffs on the classic Korean folktale 나무꾼과 선녀 ('The Woodcutter and the Fairy'): a celestial maiden is trapped into marriage with a humble woodcutter but escapes back to heaven the moment she can. Calling someone '나무꾼을 갈아탄 선녀' — 'a fairy who traded up from the woodcutter' — means she ditches whoever she's with the moment a better option appears. It's a sharp, widely understood put-down in Korean popular culture.
The 하이웨이맨스히치 is a real quick-release slip knot used in climbing and horse-riding — it can be tied fast with one hand and releases with a single tug. The significance here is that it's a specialist knot most people wouldn't know, which is why the detectives immediately think 'mountain-climbing expert.' Its deliberate looseness, as Barm notices, is what makes it sinister in a murder context.
The conversation reveals that the senior detective Park lost two sons, 현수 and 현석, to a predator years ago. 현석 was struck by a car while fleeing; 현수's remains were only identified when a tunnel construction project unearthed clothing and hair five years later. In Korean investigative culture it's common for detectives with personal loss connected to a case type to continue pursuing related cases long after officially closing them.
증거보관팀 (jeunggeo bogwan-tim) literally means 'evidence preservation team.' In the Korean police hierarchy it is seen as a dead-end administrative role, equivalent to being put out to pasture. Gomu-chi being sent there after shooting a suspect is the organisation's way of sidelining him without formally dismissing him — and he knows it, which is why he keeps threatening to quit.