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.
In Joseon-era belief, a woman who died with deep resentment inside the palace walls could become a 원귀 (won-gwi), a vengeful ghost bound to the place of her death. The thirteen spirits in the salt storehouse are understood to be palace court ladies whose grievances were never resolved, trapping them there rather than letting them pass on.
승은 (seung-eun) literally means 'receiving the king's grace' — it describes the moment a king singled out a lower-ranking palace woman for a night of intimacy. If she became pregnant, her status could rise dramatically. A 승은상궁 is a senior court lady who received this honour, giving her significant standing but also making her a target for jealousy from existing consorts.
In Joseon law, 투기 (tugi) — a wife or consort acting out of jealousy toward a husband's other women — was classified as one of the 'Seven Grounds for Divorce' (칠거지악). Accusing a royal concubine of 투기, especially of cursing rivals with a 저주물 (charm object), was therefore a serious legal and moral charge that could strip her of rank and expel her from the palace.
The phrase the ghosts repeat — 'a snake's shed skin holds a dragon's offspring' — is a classical Korean riddle-like omen. The dragon symbolises royalty, so the phrase hints that a child of low or hidden birth may carry royal blood. Hearing such words spoken by spirits would be deeply alarming to anyone at court, because it challenges the legitimacy of the succession.
세자 (seja) is the Crown Prince, the officially designated heir to the throne. Selecting a new seja was one of the most consequential political acts a king could perform, and powerful figures — here the Queen Dowager (대비) — could push to have a favoured prince's son named instead of the sitting king's own child. Such manoeuvring was a recurring source of deadly factional conflict throughout Joseon history.
무수리 (musuri) were the humblest women in the palace hierarchy, assigned to carry water and do manual chores. They were not trained court ladies and had essentially no social standing. The fact that the former 승은상궁 started as a 무수리 makes her rise extraordinary — and, in the eyes of rivals, deeply threatening to the established order.
고신 (gosin) refers to the formal use of physical torture during official interrogation, which was a legal procedure in the Joseon justice system. Suspects could be beaten with heavy boards across the thighs to extract confessions. Being subjected to 고신 while already pregnant, as the 승은상궁 was, would almost certainly cause a miscarriage — which is exactly what the story says happened to her.
고희 (go-hui) means the seventieth year of life, a milestone taken from a classical Chinese poem. Reaching seventy was considered a remarkable achievement, and a 고희연 (go-hui-yeon) is the grand celebration held in a person's honour. For a 대비 (queen dowager) to have her 고희연, it is a major court event requiring all political hostilities to be set aside — or at least hidden.
벽조목 (byeokjomok) is wood from a jujube tree that has been struck by lightning. Korean folk tradition holds that the violent energy of the lightning is absorbed into the wood, making it exceptionally dense and spiritually powerful. Weapons or talismans carved from 벽조목 were believed to be especially effective at warding off or harming evil spirits and demons.
배냇저고리 (baenaet-jeogori) is the tiny wrap-jacket sewn for a newborn and placed on the baby immediately after birth. Mothers traditionally made it by hand during pregnancy, pouring care and hopes for the child into every stitch. Keeping one buried under a tree for a child who never came to be is an image of profound, unresolved grief — and explains why the 별감's ghost cannot leave.
귀매 (gwi-mae) is a type of malevolent spirit in Korean supernatural belief that preys on the living by assuming the appearance of someone deeply loved — typically a dead parent or child. Unlike an ordinary ghost that simply haunts, a 귀매 actively deceives and draws the person toward death. Recognising one requires breaking the emotional pull, which is why 항아 shouts at 구천 to look properly.
The accusation 'you caused my death' spoken in a mother's voice is the 귀매's most powerful weapon. In Korean culture, the bond between mother and child (특히 모자 관계) carries enormous weight, and guilt toward a deceased parent is considered one of the deepest wounds a person can carry. A demon exploiting that guilt is playing on a specifically Korean emotional vulnerability, not just a generic fear.