Seodaemun Prison: From Colonial Prison to Democracy Memorial

In 1908, during the period of increasing Japanese control over Korea, Japanese authorities completed Gyeongseong Prison in Seoul, two years before Japan formally annexed the country. Originally built to hold roughly 500 prisoners, the prison soon became a major site for incarcerating Koreans who resisted Japanese rule. The architecture of the prison was heavily influenced by Western penal models. Its radial layout allowed for efficient surveillance and isolation, enabling guards to monitor large numbers of prisoners from a centralized position. For the inmates, that architecture made surveillance an unavoidable part of everyday confinement.

1919: When the Cells Overflowed

Among those imprisoned were teachers, farmers, religious figures, students, and other participants in Korea's independence movement. When the March First Movement of 1919 triggered mass demonstrations across Korea against Japanese colonial rule, the colonial authorities responded with widespread arrests. Seodaemun's inmate population surged beyond 3,000—many times the prison's original capacity—creating severe overcrowding inside the complex.

Thick walls separated the cells, limiting communication between political prisoners; inmates nevertheless developed tapping systems to communicate through them. The museum today preserves and reconstructs spaces associated with interrogation, confinement, and torture, documenting the harsh realities of those incarcerated during this period.

Yu Gwan-sun and Resistance Inside the Prison

One of the most prominent figures imprisoned at Seodaemun was Yu Gwan-sun. As a teenage student, she helped carry the March First Movement back to her hometown and led a major independence demonstration at Aunae Marketplace in Cheonan on April 1, 1919. Following her arrest, she was brought to Seodaemun. Even while incarcerated, she continued to organize resistance, initiating a large-scale protest inside the prison on the first anniversary of the movement in 1920. She was tortured during her imprisonment and died in Seodaemun in 1920.

Execution Behind the Prison Walls

At the far end of the grounds stands the execution facility—a separate wooden building where a trapdoor marks the spot where prisoners were hanged. Beside the execution building is a concealed passage now commonly described as the "Corpse Removal Tunnel," through which the bodies of executed prisoners were carried out of the prison.

Liberation Did Not End the Prison's Political Role

Following Korea's liberation in 1945, the prison was not demolished. Renamed Seoul Prison, it transitioned to the newly independent South Korean government. In subsequent decades, particularly under South Korea's authoritarian governments, the complex continued to hold political prisoners. From the 1960s through the 1980s, pro-democracy activists, labor organizers, and journalists opposing the regimes were incarcerated here. The tools of repression changed hands, but much of the architecture of confinement remained.

From Detention Center to Memorial

The facility's name evolved as its role shifted. In 1967, it was renamed the Seoul Detention Center. In 1987, the detention center relocated to Uiwang and the Seodaemun site ceased operating as a prison. Recognizing its historical weight, the city preserved key structures and opened the Seodaemun Prison History Hall in 1998 to document the struggle for independence and democracy.

Visiting Seodaemun Prison Today

The museum is located near Dongnimmun Station (Seoul Subway Line 3, Exit 5). It is open Tuesday to Sunday from 9:30 AM to 6:00 PM (closing at 5:00 PM in winter). It is normally closed on Mondays, January 1, Lunar New Year, and Chuseok; check the official site before visiting for holiday changes. Adult admission is KRW 3,000 at the time of writing; check the official site for current pricing. Visitors should expect to spend roughly two hours exploring the exhibition halls, the central prison buildings, the execution grounds, and the outdoor memorial. Visitors should approach the site respectfully because it commemorates people who were imprisoned, tortured, and executed there.

Why Seodaemun Matters

Seodaemun Prison's history is not defined by a single era. It stands as a physical record of a society that endured Japanese imperialism, navigated the turbulence of post-war authoritarianism, and later underwent the difficult transition from authoritarian rule toward democracy. The surviving red-brick walls preserve the physical trace of the political struggles that shaped modern Korea.