August 15th, 1974, 11 a.m. The opening ceremony of the subway was held in Cheongnyangni, a subway station, and the newspaper published editorials and articles congratulating the opening of the subway.

On April 12, 1971, three years and four months after the groundbreaking ceremony for Subway Line 1, the 108th train ran between Cheongnyangni and Seoul Station.

It is the first time in about 110 years since the world's first subway train opened in London, England.

The emergence of the Seoul subway system, which was described as the "revolution of public transportation," was a symbol of Korea's modernization in the 1970s.

The subway, which made its first start on the day, ran 15 meters underground and traveled 7.8 kilometers from Cheongnyangni to Seoul Station in 18 minutes. It was a breakthrough in technology at the time, and with the opening of subway line 1, Korea became the third country in Asia to own the subway after Japan and China.