If you've watched more than a few K-dramas, you've already met them — even if you didn't know their names. The man in black who comes for the dying. The giant serpent coiled around a thousand-year grudge. The grandmother who somehow knows everything about a newborn. Korean folklore is full of beings beyond the famous Gumiho and Dokkaebi, and three of them turn up again and again on screen.
I think of these three as the supporting cast of Korean myth — the figures that aren't always the headline monster but show up constantly because they carry such instant meaning. Once you can recognise them, a whole layer of K-drama storytelling opens up. A writer doesn't have to explain who the man in the black fedora is; every Korean viewer already feels the weight he brings into the room. That shorthand is exactly why these beings have survived into modern television.
Here's who they really are in Korean myth — and exactly which dramas brought each one to life. As always with folklore, I'll flag where the traditions vary, because there was never a single official version of any of this.
Where these beings come from
Korea's folk imagination grew out of several layers stacked on top of each other over many centuries. The oldest is musok (무속), indigenous Korean shamanism, with its gods of the household, the mountains, and the thresholds of life. On top of that came Buddhism, which brought elaborate ideas about the afterlife and the journey of the soul, and then Confucianism, which shaped how Koreans thought about family, duty, and the proper order of things. The beings in this guide carry sediment from all three.
That mixed inheritance is why a single figure can feel both like a folk spirit and like a cosmic bureaucrat. The grim reaper, for instance, owes his "register of the dead" and his journey to the otherworld partly to Buddhist underworld imagery, while his closeness to ordinary human grief feels older and more shamanic. You don't need to track every thread to enjoy the stories — but it helps to know that this isn't one neat mythology. It's a layered, lived-in tradition that kept absorbing new ideas.
The Grim Reaper (저승사자)
The jeoseung saja (저승사자) is Korea's grim reaper — but he isn't death itself. He's more like a civil servant of the afterlife: a guide whose job is to escort a soul from this world (이승, iseung) to the next (저승, jeoseung). In old folklore he arrives dressed in black, carrying a register with the deceased's name already written in it. There's no negotiating; when your name is called, it's simply your time.
What makes the Korean reaper so compelling on screen is that he's a bureaucrat with a soul. He follows rules he didn't write, witnesses every kind of human grief, and often carries his own quiet sadness. Modern dramas lean hard into that melancholy — the reaper as a beautiful, lonely figure caught between duty and feeling.
In folk belief there often isn't just one reaper but several, sometimes pictured arriving in a group of three to collect a soul. Families used to set out a small offering at the gate — a bowl of rice, a pair of straw shoes, a little money for the road — to treat these messengers well and, the hope went, persuade them to be gentle with the departing soul on the long walk to the otherworld. That image of death as a journey you have to be provisioned for, rather than a sudden nothing, tells you a lot about how the tradition framed dying: as a passage with stages, escorts, and etiquette.
And in the oldest stories the reaper is genuinely fearsome — not the soulful heartthrob of the dramas but an implacable official you absolutely do not want at your door. The tenderness is mostly a modern addition. The folk reaper's defining trait was that he could not be bribed out of his duty for long and could not be reasoned with once your name was in the book.
The traditional jeoseung saja wears a black hat and robe (and, in folk belief, a deathly pale face). Contemporary dramas keep the all-black look but restyle it as a sharp black suit and fedora — instantly recognisable as "the reaper" to any Korean viewer.
Join Seoul Mate free and I'll send you "Where to Start" — the 10 K-dramas I recommend to every beginner — plus a weekly pick. No spam, leave anytime.
The Imugi & the Dragon (이무기 · 용)
Korea's dragon (용, yong) is nothing like the fire-breathing monster of Western fantasy. The Korean dragon is a benevolent water deity — a bringer of rain, a guardian of rivers and seas, and a symbol of kings. But every dragon starts somewhere, and that's where the imugi (이무기) comes in.
An imugi is a giant serpent that has not yet become a dragon. In the legends it must endure — a thousand years in the water, or the favour of the heavens, or possession of the yeouiju (여의주), the wish-granting dragon orb — before it can finally ascend into the sky as a true dragon. That long, aching wait for transformation is pure drama fuel: a creature so close to glory, and so easily turned bitter by being denied it.
The exact conditions for ascension shift from tale to tale, which is half the charm. In some versions the imugi simply has to survive its thousand years without being seen or disturbed. In others it needs a sign from heaven, or to catch a falling celestial object, or to be witnessed by a pure-hearted human at the right moment. There are even regional stories where an imugi's transformation is spoiled at the last second by a careless human shout — the same "ruined at the final hurdle" tragedy you find in the Gumiho's thousand-day vigil. Korean folklore returns to that shape again and again: the long discipline, the near miss, the bitterness that follows.
The Korean dragon it hopes to become is worth pausing on too. The yong is a deeply auspicious figure — associated with kings (the throne itself was called the "dragon seat"), with rain and good harvests, and with the protection of the realm. Four guardian dragons of the directions, river dragons, and dragon kings of the sea all populate the wider tradition. So when an imugi finally ascends, it isn't just levelling up; it's crossing from danger into one of the most blessed categories of being in the whole Korean cosmos.
The dragon orb is the Korean dragon's source of power and the imugi's ultimate prize — roughly the dragon's equivalent of the Gumiho's fox bead. Whoever controls the yeouiju controls the creature's fate, which is why it sits at the centre of so many supernatural plots.
Samshin Halmi, the Birth Goddess (삼신할미)
Samshin Halmi (삼신할미) — literally the "birth grandmother spirit" — is the goddess who presides over conception, pregnancy, childbirth, and the health of young children. In traditional belief she sends each baby's soul into the world and watches over it through its most fragile years. A new mother's family would lay out a simple offering of rice and seaweed soup — the same miyeok-guk Koreans still eat after giving birth and on birthdays — to thank her.
She's the gentlest being on this list — not a monster or a reaper, but a protector. That's exactly why dramas use her to represent fate, blessing, and the unseen hand guiding a character's life.
Samshin belongs to the domestic, household side of Korean shamanism — the web of home spirits that ordinary families, especially women, actually maintained relationships with. There was a spirit of the kitchen hearth, a spirit of the house site, spirits of the gate and the storeroom; Samshin was the one you turned to for the most precious and fragile thing of all, a child. In traditional homes a corner of the room might be kept for her with a folded cloth or a jar of rice, and an older woman of the family — a grandmother or a shaman — would pray there when a baby was wanted, expected, or unwell. The "halmi" (grandmother) in her name isn't incidental: she's imagined as elderly, female, and intimately domestic, the very opposite of a distant sky-god.
The number three (삼, sam) in her name is read different ways in different sources — sometimes as three spirits acting together, sometimes pointing to her threefold care over conception, birth, and a child's early years. It's another reminder that even a tender, beloved figure like Samshin doesn't come with one fixed definition.
Ever wondered about the bluish birthmark many Korean babies are born with? Folk tradition says it's the mark left where Samshin Halmi gave the baby a gentle smack to hurry it out into the world — a sweet, very Korean way of explaining a real thing.
Folklore vs pop culture: what got changed
Dramas are wonderfully good at borrowing these figures — and just as good at quietly reshaping them. A few of the biggest shifts to keep in mind:
- The reaper got beautiful and sad. The folk jeoseung saja was a fearsome official you dreaded. The drama reaper is a melancholy heartthrob with a tragic backstory. Goblin in particular essentially invented its reaper's amnesia and doomed past love — gorgeous, and not from the old myth.
- The imugi became a tidy villain. Folklore frames the imugi mostly as a being on a long journey toward dragonhood. Dramas often flatten that into "evil ancient serpent," which is one valid reading but skips the more sympathetic, striving version.
- Samshin turns symbolic. On screen the birth goddess usually appears as a mysterious figure nudging fate, rather than the concrete household spirit families actually kept a corner of rice for. The warmth survives; the everyday ritual context mostly drops away.
None of these changes are wrong — they're how a living tradition keeps breathing. But if you go from the dramas back to the folklore, expect the originals to be rougher, stranger, and a lot more embedded in the texture of daily life than the polished screen versions suggest.
Frequently asked questions
Is the Korean grim reaper the same as the Western Grim Reaper? Not quite. He doesn't carry a scythe or personify death itself — he's an escort, a kind of afterlife civil servant who guides the soul from this world to the next. The all-black dress is similar; the bureaucratic, dutiful role is very Korean.
What's the difference between an imugi and a dragon? An imugi (이무기) is a serpent that hasn't yet ascended; a dragon (용, yong) is what it can become after enduring the right conditions. Think of the imugi as a dragon-in-waiting — and in some tales, a dragon-denied who turns bitter.
Is Samshin Halmi a goddess or a ghost? A goddess, firmly — a benevolent household deity of birth and young children, not the spirit of someone who died. She belongs to a completely different category from the gwisin (귀신), who are lingering human souls.
Why these beings still matter
What ties the reaper, the dragon, and the birth goddess together is that each one marks a threshold in a human life: being born, becoming who you're meant to be, and dying. Korean folklore gave a face to each of those mysteries — and K-dramas keep reaching for those faces because they carry instant emotional weight that a brand-new character never could.
Next time one of them appears on screen, you'll know the centuries of story standing behind them.
Meet the Gumiho, the nine-tailed fox, the Dokkaebi, Korea's mischievous goblins, and Korean ghosts (gwisin) — or try our AI Drama Recommender to find dramas full of Korean supernatural beings.