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.
North Korean agents in dramas are often given river-based codenames. 대동강 (Daedong River) runs through Pyongyang and is the most symbolically significant river in the North, so '대동강 1호' (Daedong River No. 1) signals a high-ranking operative. The naming convention echoes real Cold-War-era spy tradecraft where operatives used geographic or numeric aliases instead of real identities.
대선 is short for 대통령 선거, the presidential election. South Korea holds direct presidential elections every five years, and in the early-1990s setting of this drama the stakes were enormous — it was the first era of genuinely competitive multi-party races after decades of military rule. The conspirators' entire scheme is timed around controlling who wins.
An 음악다방 (music tearoom/café) was a fixture of South Korean city life from the 1960s through the 1980s. Customers would request songs — often Western pop or Korean ballads — and a DJ or live singer would perform them. For many young Koreans it was the only place to hear recorded music they couldn't afford to own, making it a deeply romantic cultural touchstone.
국가보위부 (State Security Department) is North Korea's political secret police, responsible for surveillance, counterintelligence, and controlling the population. Its agents abroad ran overseas spy networks, which is the role Choi Su-ryeon occupies in the drama. The organisation is often compared to the Soviet KGB in its scope.
멸사봉공 (滅私奉公) is a four-character Sino-Korean idiom meaning 'extinguish the self, serve the public.' It was a favourite phrase of authoritarian governments in both Koreas to demand total loyalty from officials and soldiers. Nam Tae-il uses it here with heavy irony, eulogising someone he has just tried to have killed.
The tension between 사상 (ideology/political beliefs) and 사랑 (love) is a central theme of the drama. In North Korean society, loyalty to the state is officially expected to override all personal bonds — family, romance, friendship. Kang-mu's wry observation that love seems to be winning inverts the propaganda the agents grew up with.
근로 장학생 (work-study scholarship student) is a university financial-aid category where students perform campus labour — cleaning, serving in the cafeteria, administrative tasks — in exchange for reduced tuition or dormitory fees. It is strongly associated with students from low-income families, so the other students are shocked that someone they assumed was privileged held this status.
안기부 (Agency for National Security Planning, the predecessor to today's NIS) was widely accused of torturing political suspects during the authoritarian era. The student's account of her brother losing half his body weight and suffering lasting mental illness reflects documented human-rights cases from that period. This moment grounds the drama's thriller plot in real historical trauma.
고정간첩 (固定間諜) literally means 'fixed spy' — someone planted in South Korean society for the long term, living an ordinary life and gathering intelligence over years or decades. The term carries enormous weight in Korea because Cold War-era propaganda made ordinary citizens deeply fearful of neighbours who might secretly be agents. Accusing someone of being a 고정간첩 was one of the most damaging things you could say.
부적 are paper talismans written by a 도사 (fortune-teller or shaman practitioner) and used to attract good luck, ward off evil, or fulfil a wish. Wealthy Korean families, particularly older women, have historically consulted 도사 for guidance on marriages, business, and health. Seong-sim paid a fortune-teller to recommend keeping a specific person close to her husband — the comedy here is that the 'auspicious' recommendation turned out to be a spy.
계백 (階伯) was a 7th-century Baekje general famous for killing his own wife and children before his final battle against Silla and Tang forces, so they would not be taken as slaves if he fell. The story is taught in Korean schools as an extreme example of devotion to one's country over family. The president invoking this legend is essentially telling Eun Chang-su to sacrifice his daughter for the state.
상사맨 (from 종합상사, general trading company) refers to employees of Korea's large conglomerate trading arms — think Samsung Trading, LG International, Daewoo — who were posted overseas to source goods and open markets. In the 1980s–90s they were a common sight across Eastern Europe, so using this identity as cover for a North Korean agent is both plausible and quietly ironic.