13 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.
세자 (se-ja) is the Crown Prince — the king's designated heir. The East Palace (동궁, dong-gung) in the episode title is literally the residence of the Crown Prince, so when characters say the palace ghost is targeting 동궁's bloodline, they mean the heirs to the throne specifically.
예장 (ye-jang) refers to the elaborate state funeral ceremonies reserved for royalty. The king ordering it to proceed swiftly shows he is already treating the Crown Prince as dead — and that maintaining political order matters more to him in this moment than public grief.
성리학 (Seong-ni-hak) — Neo-Confucianism — was the official state philosophy of Joseon. It held a strictly rational, ordered view of the world and dismissed belief in spirits as superstition unworthy of educated men. The king invoking it here is a deliberate political statement: a ruler who fears ghosts looks weak.
The repeated 아이고 cries you hear are 곡 (gok) — formal mourning wails performed by court ladies and officials after a royal death. It follows strict etiquette: participants cry in rhythm and stop only on the king's command. Think of it as choreographed grief, not spontaneous weeping.
A 무당 (mu-dang) is a Korean shaman, traditionally a woman, who acts as a bridge between the living and the spirit world. They perform 굿 (gut) rituals to communicate with or expel spirits. Bringing one into the Confucian royal palace is a desperate, secret act — it would be deeply scandalous if it became known.
In Korean shamanic belief, a god (신, sin) who possesses a shaman can turn wrathful if the shaman breaks ritual taboos — including becoming pregnant. The idea that the deity 'sent 살 (sal, a curse-arrow of misfortune)' onto the mother explains why Gucheon survived: dying and coming back from the spirit world is thought to open a person's eyes to the unseen.
땡중 (ttaeng-jung) is a dismissive slang term for a Buddhist monk who ignores his vows — lazy, greedy, or worldly. Gucheon throws it at the monk as an insult, then cheerfully applies it to himself too. It signals he sees their shared life at the temple as a farce rather than genuine religious practice.
풍수 (pung-su) — Korean geomancy — is the art of reading how the flow of natural energy through a landscape affects human fortune. A 풍수사 is a geomancer hired to survey buildings and burial sites. The king uses this respectable, rational-sounding title as a cover story so Gucheon can move freely in the palace without anyone knowing the real reason he was brought in.
감찰 궁녀 (gam-chal gung-nyeo) were court ladies assigned to monitor conduct inside the palace — watching for rule-breaking among other servants and reporting upward. Saenggang introduces herself with this title to establish authority, which is why she bristles so hard at Gucheon's complete disregard for court manners.
Gucheon lays out a folk taxonomy here. 귀매 (gwi-mae) are not human souls at all — they are malevolent energy that accumulates in a place over time, like mold. 일반귀 (il-ban gwi) are ordinary lingering souls. 원귀 (won-gwi) are the most dangerous: people who died with deep, unresolved resentment (한, han) and whose hatred keeps them tethered to earth.
In Korean and broader East Asian folk belief, the peach tree is thought to repel evil spirits. A branch cut from the east-facing side carries the strongest 양기 (yang-gi, positive solar energy) because the east is where the sun rises. Ritual tools and protective talismans were often carved from peach wood for this reason.
Gucheon's technique echoes his own origin story: he 'died' in water as a child and came back able to see spirits. By submerging himself and smearing the peach branch with his blood — mixing living-world markers — he is deliberately crossing into 귀의 세계 (the realm of spirits) to confront the ghost on its own ground rather than waiting for it to come to him.
The phrase Gucheon chants is a Sino-Korean exorcism formula calling on divine authority to name and expel an unknown spirit — roughly 'small and nameless, reveal yourself.' Such spoken chants (주문, ju-mun) are central to Korean shamanic and Buddhist folk ritual, meant to strip a ghost of the anonymity that makes it powerful.