9 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 (gosaeng haesseo) literally means 'you worked hard' or 'you suffered through that.' In Korean delivery rooms it is the standard first thing a husband or family member says to a mother the moment a baby arrives — a heartfelt acknowledgment of the pain of labor rather than a generic 'congratulations.'
Calling a newborn '한서준 2세' — 'Han Seo-jun the Second' — is a common Korean way of saying the baby is the spitting image of the father. It carries the same playful pride as saying 'a chip off the old block,' and the phrase '누가 … 아니랄까 봐' (roughly 'just like we'd expect from …') adds an affectionate teasing tone.
Disused 요양병원 (long-term care hospitals) dot the Korean countryside, many closed after stricter regulations in the 2000s thinned out underfunded facilities. Their remote locations and empty wards make them a recurring hideout in Korean crime dramas — audiences immediately understand the creepiness the setting is meant to signal.
The doctor pinpoints the 해마 (haema — hippocampus), naming it as the structure 'just inside the 측두엽 (temporal lobe).' Korean medical dramas routinely explain anatomy in plain terms because public health literacy campaigns in Korea have made brain-region vocabulary fairly familiar to everyday viewers, so the scene doubles as exposition the audience is expected to follow.
The drama's fictional 20th presidential election mirrors Korea's real electoral cycle: the country holds a single-round direct presidential vote every five years, with a strictly regulated official campaign period (공식 선거 운동) of just two weeks. The show uses falling approval ratings and the approaching vote to show how political pressure shapes police decisions — a dynamic Korean viewers read instantly.
총명탕 (Chongmyeongtang) is a classical herbal decoction whose name literally means 'sharp-mind soup.' It combines herbs such as acorus root, polygala, and poria mushroom and has been prescribed in Korean traditional medicine (한의학) for centuries to improve memory and concentration. Giving it to Barm right after his brain surgery is a gentle, folk-remedy gesture of care.
Being assigned to a 증거보관팀 (evidence storage team) is understood by Korean officers as a form of administrative exile — the police equivalent of being shuffled into a broom closet. It carries no prestige and almost no path to promotion, which is why Go Mu-chi reads it as punishment for the shooting controversy rather than as a real posting.
The mention of 구련산 터널 공사 (Guryeon Mountain tunnel construction) unearthing a child's clothing is a nod to a real pattern in Korean cold-case history: major infrastructure projects in mountainous areas have occasionally surfaced remains from decades-old crimes. The detail grounds the fictional backstory in a landscape Korean viewers find entirely plausible.
기 싸움 (gi ssaum) refers to the unspoken contest of wills — who can project stronger presence and refuse to be intimidated — that Koreans recognize as happening before a single word is exchanged. Barm's internal reminder not to lose this battle reflects a cultural belief that eye contact, posture, and composure carry real power, especially when confronting a manipulative opponent.