A visitor pays tribute to a victim of a pro-democracy revolution in 1960 at the April 19 National Cemetery in Seoul on April 19, 2020. (Yonhap)
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This photo, provided by Cheong Wa Dae, shows a congratulatory note that U.S.

A magpie sits on the tomb of a victim of the April 19 Revolution at a national cemetery in northern Seoul on April 17, 2020, two days ahead of the 60th anniversary of the student-led pro-democracy

An employee views rice seedlings at a nursery of an agricultural cooperative in Naju, South Jeolla Province, southwestern South Korea, on April 17, 2020, two days ahead of "gogu," one of the 24 sea

People take part in a memorial ceremony in Ansan, south of Seoul, on April 16, 2020, for victims of the 2014 sinking of a passenger ferry, in this photo provided by Danwon High School.

Seoullo 7017 pedestrian overpass, near Seoul Station, is cast in a blue light on April 16, 2020, as part of the Blue Light Campaign to express gratitude to South Korean medical personnel for fighti

Education Minister Yoo Eun-hye speaks during a memorial ceremony in Ansan, south of Seoul, on April 16, 2020, for victims of a 2014 sinking of a passenger ferry.

A model shows three kinds of commemorative medals -- two made of gold and one made of silver -- during a publicity event in Seoul on April 16, 2020, to unveil them that coin maker Poongsan Hwadong

Bereaved families throw flowers into the sea for those killed in a 2014 sinking of a passenger ferry off South Korea's western coast near Jindo Island on April 16, 2020, the sixth anniversary of th

Chun Yong-jae, head of Yongsan Elementary School in Seoul, greets his students as online classes for middle and high school freshmen and juniors and elementary school students in grades four throug