A medical worker wears her protective gear with a cooling vest at a public heath facility for coronavirus tests in Seoul on June 10, 2020, amid a heat wave. (Yonhap)

President Moon Jae-in offers a silent prayer for the late student activist Lee Han-yeol at the Democracy and Human Rights Memorial Hall in Seoul on June 10, 2020, after attending a ceremony to mark

Bae Eun-shim, the mother of the late student activist Lee Han-yeol, reads her letter to her son during a ceremony to mark the June 10, 1987, democratization movement at the Democracy and Human Righ

This photo, taken on June 9, 2020, shows a woodblock print depicting student activist Lee Han-yeol that was revealed during a memorial at Yonsei University in Seoul to mark the 33rd anniversary of

Two farmers look at ripening bananas at a greenhouse in Haenam, a seaside town in southwestern South Korea, on June 9, 2020.

Flowers are laid at a site for excavating the remains of a South Korean soldier killed in the 1950-53 Korean War in Hwacheon, Gangwon Province, northeastern South Korea, on June 8, 2020.

The crew of the Navy's diesel-electric air independence propulsion submarine, Hong Beom-do, takes part in a ceremony at a naval base in the southeastern city of Changwon on June 5, 2020, to pay tri

This photo shows the Korean-language 2020 Yonhap Annual summarizing the overall aspects of South Korea in 2019, published on June 8, 2020. Its English version is scheduled to follow in July.

Farmers plant rice seedlings at a rice paddy inside a crater in the city of Seogwipo on South Korea's largest island of Jeju on June 8, 2020. (Yonhap)
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Shoppers line up to buy thinner face masks at an E-mart supermarket in Goyang, north of Seoul, on June 6, 2020. Demand for such face masks has risen due to the rising temperature. (Yonhap)