Park Young-sun (C), a candidate of the ruling Democratic Party, poses with her supporters during a campaign for the April 7 Seoul mayoral by-election in Seoul on April 6, 2021. (Photo by Jung Yeon-je/AFP Photo)





A health official checks names of migrant workers as they wait for coronavirus testing at a makeshift clinic in Seoul, South Korea, Friday, March 19, 2021. Britain's ambassador to South Korea on Thursday criticized South Korean health authorities for mandating coronavirus tests on all foreign workers in capital Seoul and nearby Gyeonggi Province in a mass testing campaign that has triggered complaints about racial discrimination. (Photo by Ahn Young-joon/AP Photo)





Lyoo Chan-hee, 10, Lyoo Chae-hee, 7, and Kim Si-hu, 9, make their way to school on the first day of the new semester, on Nokdo island in Boryeong, South Korea, March 2, 2021. Lyoo Chan-hee wishes he wasn't one of the last three schoolkids left playing on the beaches of Nokdo island. Instead, he often plays with Kim Si-young - aged 66, and one of the last 100 or so residents of a once-vibrant fishing village emblematic of the demographic crisis unfolding in South Korea. (Photo by Kim Hong-Ji/Reuters)





Workers wearing protective gears disinfect as a precaution against the coronavirus ahead of the early voting for the upcoming Seoul mayoral by-election at a local polling station in Seoul, South Korea, Thursday, April 1, 2021. The early voting for the April 7 Seoul and Busan mayoral by-election will be held for two-days on April 2-3. (Photo by Lee Jin-man/AP Photo)





Monks harvest the first green tea leaves of the season at a farm of Tongdo Temple in Yangsan, 420 kilometers southeast of Seoul, South Kore​a, 23 April 2021. (Photo by Yonhap/EPA/EFE)





A photo showing North Korea's missile launch is displayed at the Unification Observation Post in Paju, near the border with North Korea, South Korea, Wednesday, March 24, 2021. North Korea fired short-range missiles this past weekend, just days after the sister of Kim Jong Un threatened the United States and South Korea for holding joint military exercises. (Photo by Ahn Young-joon/AP Photo)





This picture taken on March 31, 2021 shows a visitor looking at the art installation “Outi Pieski” by Eeva-Kristiina Harlin during a preview of the 13th Gwangju Biennale at an exhibition hall in the southwestern city of Gwangju. (Photo by Jung Yeon-je/AFP Photo)





Oh Se-hoon, left, the candidate of the main opposition People Power Party, bumps fists with a vendor during a campaign for the April 7 Seoul mayoral by-election at a market in Seoul, South Korea, Tuesday, April 6, 2021. (Photo by Ahn Young-joon/AP Photo)





Commuters watch a TV showing a file image of North Korean leader Kim Jong Un and U.S. President Joe Biden during a news program at the Suseo Railway Station in Seoul, South Korea, Friday. March 26, 2021. North Korea on Friday confirmed it had tested a new guided missile, as Biden warned of consequences if Pyongyang escalates tensions amid stalled nuclear negotiations. (Photo by Ahn Young-joon/AP Photo)





A South Korean elderly woman receives the first dose of the Pfizer-BioNTech COVID-19 vaccine at a vaccination center in Seoul, South Korea, Thursday, April 1, 2021. South Korea started its coronavirus vaccination for senior citizens over 75 years old. (Photo by Chung Sung-Jun/Pool Photo via AP Photo)





South Korean peace activists lie on a street to pay tribute to the victims of the recent protests in Myanmar, during a rally against Myanmar's military coup in Seoul, South Korea, Friday, March 26, 2021. (Photo by Ahn Young-joon/AP Photo)





Kim Myung-soon, a haenyeo, also known as a “sea woman”, comes up for air as she dives in the sea off Geoje, South Korea, March 31, 2021. (Photo by Kim Hong-Ji/Reuters)





People play Chinese chess at a park under a cherry blossom trees near Bulgwangcheon Stream, in Seoul, South Korea, April 1, 2021. (Photo by Heo Ran/Reuters)





A South Korea university student gets her head shaved during a protest against Japan's decision to release contaminated water from its crippled Fukushima nuclear plant into the sea, in front of the Japanese embassy, in Seoul, South Korea, April 20, 2021. (Photo by Kim Hong-ji/Reuters)





A South Korean army's K1A2 tank moves during a military exercise in Paju, South Korea, near the border with North Korea, Wednesday, March 17, 2021. In North Korea's first comments directed at the Biden administration, Kim Jong Un's powerful sister Kim Yo Jong on Tuesday warned the United States to “refrain from causing a stink” if it wants to “sleep in peace” for the next four years. (Photo by Ahn Young-joon/AP Photo)





People walk through a field of tulips in full bloom at the Everland amusement park in Yongin, south of Seoul, South Korea, 26 March 2021. (Photo by Yonhap/EPA/EFE)





People wearing face masks to protect help against the spread of the coronavirus take pictures under cherry blossoms in full bloom at a park in Seoul, South Korea, Thursday, April 1, 2021. (Photo by Ahn Young-joon/AP Photo)





A man wearing a protective mask photographs his wife amid the coronavirus disease (COVID-19) pandemic at the Gyeongbok palace in Seoul, South Korea, May 3, 2021. (Photo by Kim Hong-Ji/Reuters)





People enjoy outdoor dining at plastic bubbles, observing social distancing against the spread of the coronavirus at a restaurant near the Han River in Seoul, South Korea, Friday, April 9, 2021. (Photo by Ahn Young-joon/AP Photo)





Pedestrians walk at a crossroads in Seoul, South Korea, 26 March 2021. The South Korean government announced on 26 March an extension of the ongoing COVID-19 restriction that were originally set to end on 28 March. The restrictions, enforced for two more weeks, include a ban on meetings of five people or more. (Photo by Yonhap/EPA/EFE)