10 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 opening monologue reveals a child who feels no empathy when he stumbles on a dying victim — only annoyance at having his game interrupted. In Korean criminal psychology discourse, this emotional void is a defining marker of 사이코패스 (sa-i-ko-pae-seu, psychopath), a term the show uses clinically throughout the series. The scene deliberately echoes the show's central question: can someone be born without the capacity for human feeling?
A news report describes a woman in her seventies found hanged on a park trail, a handwritten 유서 (yu-seo, suicide note) left at the scene. In Korean culture, a handwritten note carries heavy moral weight — it is treated as a final declaration of intent and is central to how police establish identity and motive. The detail that she chose this act to stop her son's violence gives the note a sacrificial quality that viewers would feel deeply.
The passage quoted — 'as he has done, so shall it be done to him; wound for wound, eye for eye, tooth for tooth' — is from Leviticus 24 in the Old Testament. Korea has a significant Christian population (roughly 30%), and Biblical quotes land with cultural familiarity for many viewers. The show uses it here to frame the vigilante killing as a form of divine justice, which mirrors the online public sentiment shown in later scenes.
대포차 (dae-po-cha, literally 'cannon car') is Korean slang for a vehicle registered under a fake or stolen identity — essentially an untraceable ghost car used by criminals to avoid surveillance. When detectives discover the truck that ran Go Mu-chi off the road is a 대포차, it means there is no paper trail to follow, which is a classic dead-end in Korean crime investigations.
담배빵 (dam-bae-ppang) is Korean slang for burning someone's skin with a lit cigarette — a form of torture or punishment associated with school bullying and organized crime. The critical detail here is that this injury was never released to the press, meaning only the original investigating detectives knew about it. Its replication on the new victim points to either an insider or someone with access to sealed police files, which is what drives the plot toward a shocking possibility.
대권 도전 (dae-gwon do-jeon, 'challenging for supreme power') is the standard Korean phrase for a presidential candidacy run. Shin Candidate's campaign is used throughout Mouse as political backdrop — a presidential hopeful's family being entangled in a serial-killer investigation is a staple of Korean thriller dramas, reflecting public distrust of political dynasties and the way powerful families can pressure law enforcement.
패피 (pae-pi) is a popular Korean portmanteau of '패션 피플' (fashion people) — someone with great personal style. Its opposite, 패테 (pae-te), is short for '패션 테러리스트' (fashion terrorist), someone with disastrously bad taste in clothes. The exchange is a generational gag: the older detective has no idea what either word means, while the younger officer uses them as casually as breathing. These portmanteau slang words are extremely common in Korean internet and youth culture.
Officer Shin explains that lying triggers a release of 카테콜아민 (ka-te-kol-a-min, catecholamines) — stress hormones including adrenaline — which cause nasal tissue to swell slightly, producing an urge to touch or rub the nose. This is a real physiological claim popularized in Korean police and psychology TV programs, though its reliability as a lie-detection cue is debated by scientists. Korean crime dramas frequently include this kind of pseudo-scientific behavioral profiling to explain character reads.
증거인멸죄 (jeung-geo-in-myeol-joe, the crime of destroying evidence) carries up to five years in prison under Korean law. Detective Shin uses the exact sentencing ceiling as leverage when confronting the PD, a very typical Korean procedural move — investigators cite specific statutes and maximum penalties in the room rather than leaving them abstract. It makes the legal threat feel concrete and immediate rather than theoretical.
고 무치's phrase '이 또 아쌀한 하나님이 도우사' is a colorful, colloquial way of saying 'and wouldn't you know it, God came through again.' 아쌀하다 is a dialect/slang adjective meaning something pleasantly crisp or just right, used here affectionately about divine timing. It's the kind of folksy, slightly irreverent religious expression common among older Koreans — not sacrilegious, just warm and informal, like saying 'the good Lord works in mysterious ways.'