11 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.
여정 says he always knew his own 쓰임 — literally 'the use I'd be put to.' In Korean social thinking, relationships are often described in terms of 쓰다/쓰이다 (to use / to be used), and acknowledging it openly like this is surprisingly frank. He isn't bitter; he's saying he chose to be useful on his own terms, which reframes the whole dynamic between him and 동은.
동은 tells 혜정 she pursued revenge so that her tormentors would be forced to remember her — because for 18 years they had simply forgotten she existed. In Korean school culture, being erased or ignored by a group can feel more devastating than open conflict, since belonging to a group (우리, uri) is central to identity. Revenge here is as much about reclaiming existence as it is about punishment.
동은 explains that 재준 has 녹내장 (glaucoma) and uses 안압하강제, drops that lower the pressure inside the eye, once a day. Glaucoma is manageable but irreversible if the medication is tampered with or the eye is damaged — which is exactly what 동은's plan exploits. The clinical detail is very deliberate: she's been watching him precisely long enough to know his medical routine.
영준's henchmen demand 퇴직금, the legally required severance pay Korean employers must give workers when they leave. Using this office-worker term in a mob shake-down is darkly comic: they're framing their criminal labour as ordinary employment and invoking workers' rights. The joke also signals they're turning on him — demanding payment for all the dirty work ('the shit we cleaned up') they did on his behalf.
홍영애 is taken away on a murder charge linked to the 'simple rainy-day traffic accident' that was described just moments earlier. In Korea, a traffic death caused deliberately or while under duress can be prosecuted as murder rather than negligent homicide — a much more serious charge. The detail about her phone records showing she was being blackmailed ('your daughter killed someone') is what elevates it from an accident to a criminal case.
The twist that 연진 has become the prison's weather announcer lands differently knowing Korean context: inmates in Korean correctional facilities can earn small privileges or roles through good behaviour, and delivering facility announcements is a real, mundane duty. The other inmates calling her '이쁜아' (hey, pretty one) and asking for the weather like she's a TV presenter is a humiliating echo of her former glamorous public image.
청송교도소 (Cheongsong Prison) in North Gyeongsang Province is South Korea's most notorious maximum-security facility, historically reserved for the most dangerous long-term inmates. 동은 asks the gangster boss whether 강영천 can be transferred somewhere even worse; the answer — 지산교도소 — is a fictional name used here for dramatic effect, but the real-world reference to 청송 is instantly understood by Korean viewers as shorthand for the bleakest possible incarceration.
The grandmother says '봄에 죽자, 응?' — 'Let's die in spring, okay?' 동은 later reveals she realised this was actually '봄에 피자' — 'Let's bloom in spring.' In Korean, 죽다 (to die) and 피다 (to bloom/blossom) don't sound alike, but the joke is that only now, with distance and healing, can 동은 reinterpret the old woman's meaning as one of hope rather than despair. It's a gentle, moving reframe of the whole ending.
동은 mentions her new tutee's father is a 교정본부 정책관, a policy official in the Korea Correctional Service — the government body that oversees all prisons. Choosing this family as a tutoring client is not accidental: it gives 동은 indirect access to influence over prison management, tying directly into her plan to have 강영천 transferred to a harsher facility. 과외 (private tutoring) remains one of the most common and socially accepted forms of private employment in Korea.
혜정 leaves 재준 a note referencing 대포폰 and 대포차 — literally 'cannon phone' and 'cannon car,' slang for burner phones and unregistered vehicles bought under false names. Both are illegal in South Korea but widely known as tools used by criminals and people trying to disappear off the grid. Giving them to the now-blind, helpless 재준 as his only lifeline — with just the words 'Good Luck' — is her version of revenge.
여정 tells 강영천 that his oath to heal applies only to humans — not to beasts or demons. He's referencing the 히포크라테스 선서 (Hippocratic Oath), which Korean medical students formally take upon graduation. The oath's injunction to 'do no harm' is well known to Korean viewers. 여정's reinterpretation — that he simply doesn't classify 강영천 as a patient who qualifies — is chilling precisely because he delivers it with the calm authority of a doctor explaining a diagnosis.