An election official shows a voting stamp with which voters mark their ballots while installing a polling station in Seoul on April 6, 2021, the eve of the Seoul mayoral by-election. (Yonhap)

People who were forced to leave or flee North Korea hold a traditional rite at a public cemetery in the southwestern city of Gwangju on April 5, 2021, to pay tribute to their ancestors, marking the

Fans take in a Korea Baseball Organization regular season game between the home team Doosan Bears and the Kia Tigers at Jamsil Baseball Stadium in Seoul on April 4, 2021. (Yonhap)
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Kids plant saplings in a field in the southeastern city of Daegu on April 2, 2021, on the occasion of Arbor Day that will come on April 5. (Yonhap)
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A voter wearing sanitary gloves casts a ballot at a polling station in Seoul on the first day of two-day early voting for the April 7 Seoul mayoral by-election on April 2, 2021. (Yonhap)

A visitor enjoys the 13th Gwangju Biennale in Gwangju, 330 kilometers south of Seoul, on April 1, 2021, after it was opened to the public.

This photo, released by the state-run Korea Minting, Security Printing & ID Card Operating Corp.

Workers harvest the first green tea crop of the season at a farm on South Korea's southern island of Jeju on April 1, 2021. (Yonhap)
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Celebrities cut the tape at the opening ceremony of the 13th Gwangju Biennale in Gwangju, 330 kilometers south of Seoul, on March 31, 2021.

These photos, provided by the interior ministry, show Yu Gwan-sun (far R, back row, top), an icon of the March 1, 1919, Independence Movement against the Japanese colonial rule of Korea (1910-45),