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SEOUL, South Korea — When a call for peaceful protests in support of Korean independence came in spring 1919, a 16-year-old girl named Yu Gwan-sun became the face of a nation’s collective yearning for freedom.

Yu was a student at Ewha Haktang in Seoul, which was established by American missionaries as the first modern educational institution for women in Korea. On March 1, 1919, Yu and four classmates joined others taking to the streets with cries of “Mansei!” (“Long live Korean independence!”) in one of the earliest protests against Japanese colonial rule. Amid the demonstration, the Declaration of Independence — written by the publisher Choe Nam-seon and signed by 33 Korean cultural and religious leaders — was recited at Seoul’s Pagoda Park.

The next day, protest organizers came to Ewha Haktang and encouraged Yu and her peers to join a student demonstration to be staged in three days. On March 5, she and her classmates marched at Namdaemun, a gate in central Seoul. They were detained by the Japanese authorities, but missionaries from the school negotiated their release.