The Cheonggyecheon Stream defines the history of Seoul. Ghosts still lurk its winding path. Learn the surprising stories behind the stream that Seoul never left well enough alone.

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Produced by Joe McPherson and Shawn Morrissey

Music by Soraksan

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Cheonggyecheon: Seoul’s River of Ghosts, Progress, and Politics

Cheonggyecheon runs like a scar through Seoul. Ten and a half kilometers of water cut through the city’s history, carrying everything from royal sewage to shantytown dreams. Today it’s one of Seoul’s proudest landmarks, but it has never flowed naturally or peacefully. The story of this stream is the story of Seoul itself: beauty built on bulldozers, politics, and ghosts.

The River That Built a City

Cheonggyecheon’s source is the Suseongdong Valley in Inwangsan, collecting runoff from northern Seoul and flowing east to join Jungnangcheon near Wangsimni. It has always been reshaped to fit the city’s needs.

In the Joseon era, it was called Gaecheon, meaning “Open Stream.” It flooded constantly, drowning homes and clogging with junk. King Yeongjo led the first major public works project, mobilizing 200,000 workers for nearly two months to dredge, straighten, and reinforce the riverbanks. Even then, it kept flooding. It also dried up, filled with garbage, and reeked of sewage.

The work never stopped. Every few decades, the stream had to be cleared again. By the 1790s, it was still being dredged.

From Gaecheon to Cheonggyecheon

During Japanese colonial rule, the stream got its current name, Cheonggyecheon. The name might sound pretty, but the water was anything but. It was a dumping ground. Wastewater and corpses floated side by side.

In 1917, the colonial government drafted a sewer plan, but the post–World War I depression froze it. By the 1920s, Cheonggyecheon was infamous for its stench. In the 1930s, under new urban planning laws, tributaries were covered, sewers were installed, and roads were expanded. The main stream was partially capped, setting the stage for what would later become one of the most controversial redevelopment projects in Korean history.

From War to Overpass

After the Korean War, the stream became the heart of the refugee shantytowns. Floods brought not just water but disease. The smell became part of the city’s air.

In 1958, the covering began. By 1960, Cheonggyecheon had been paved over. A decade later, the Cheonggye Overpass rose above it, a concrete monument to industrial progress. The mayor at the time, Kim Hyeon-ok, nicknamed “the Bulldozer,” oversaw it all. He also gave Seoul the Namsan Tunnel, Sewoon Shopping Mall, and the doomed Wau Apartments.

People said the overpass tamed the chaos, but the ghosts stayed. Corpses had been dumped there for generations. Locals claimed their spirits haunted the highway above.

The Overpass Years

For all its ugliness, the Cheonggye Overpass became oddly romanticized. It was the city’s beating black market heart. Vendors sold everything—used books, radio parts, antique tools, and sometimes things no one was supposed to sell.

“You could build a tank or a submarine just by walking the Cheonggye once,” people said. It wasn’t an exaggeration. One team reportedly found a 155mm artillery barrel there while sourcing parts for Park Chung-hee’s Baekgom missile.

By the 1970s and 80s, Cheonggye was the cradle of Seoul’s electronics boom. You could buy a black-and-white TV small enough to carry into the mountains. A tropical fish market bloomed between Dongdaemun and Dongmyo, filled with smuggled animals and questionable “medicines.” Hamsters cooked alive in summer heat. Crocodiles and tortoises sat beside pirated Japanese media, banned under import laws.

Before the internet, this was Korea’s underground pipeline for pop culture. The DNA of modern K-pop was floating in those stalls alongside neon fish.

The Restoration Dream

By the 1990s, the overpass was rotting. The U.S. military reportedly warned soldiers not to drive on it. Seoul’s center of gravity had shifted to Gangnam. The overpass now blocked traffic more than it helped.

Professors and writers began calling for a full restoration. Among them were Noh Su-hong and Lee Hee-du of Yonsei University and novelist Park Kyung-ri. Their Cheonggyecheon Restoration Research Society held symposiums throughout the early 2000s.

At one of these in 2002, mayoral hopeful Lee Myung-bak made a promise: restore the stream if elected. He won. Work began in July 2003 and ended in September 2005.

It was fast. Too fast.

Broken Promises and Missing Paperwork

Merchants were forced to move. Negotiations for relocation sites began in early 2003, but the city refused to compensate anyone for business losses. No contracts were signed. Lee’s administration famously avoided written agreements, claiming that government policies “did not require negotiation.”

The new complex at Garden Five was supposed to house displaced businesses. It became a debacle of unfinished promises and empty space. Some vendors foresaw the chaos and relocated on their own.

Buried Relics and Bureaucracy

Archaeologists warned that the restoration site contained Joseon relics and bridge remains. Construction halted multiple times, but Lee declared the finds “not historically valuable.” Many artifacts ended up stored in sewage facilities or forgotten in warehouses.

Some bridges were reconstructed inaccurately. The original Supyo Bridge was saved and moved to Jangchungdan Park.

Traffic, Water, and Illusions

Critics asked what would happen to traffic once the overpass was gone. They were right to worry. Central Seoul’s roads remain clogged, and there are still talks of partially rebuilding sections.

The water itself isn’t natural. The original source at Inwangsan is mostly dry. The new Cheonggyecheon is fed by a pumped mix of Han River and groundwater, four parts to one. The upstream section is sculpted; only downstream does it start to look like a river.

Don’t drink it. Don’t wade in it. Tests have shown high E. coli counts. Locals say that’s tradition—the stream was always filthy. Think of it less as a river and more as an urban water feature.

Cost and Consequence

Maintenance costs run into billions of won each year. Still, the stream helped drop city-center temperatures by about three degrees and finally stopped the chronic flooding in Jongno.

Property values around it soared. The model of urban river restoration spread across Korea and even overseas. Some were successful. Others, like Busan’s version, became expensive quagmires.

Cheonggyecheon Today and Tomorrow

The Cheonggyecheon 2050 Master Plan, announced in 2013, aims to make the stream look more natural—more curves, more trees, fewer weirs. Supyo, Gwantong, and Ogwan Sumun bridges are set for full restoration. Two lost tributaries, Baekundongcheon and Junghakcheon, will be revived to stabilize water flow.

Still, it will never return to its original state. The original Gaecheon ran in cycles of flood and drought. The modern Cheonggyecheon is a managed illusion, a garden stream in the middle of a hyper-modern city.

It’s beautiful, but beauty here has always been engineered.