Customers line up to eat "samgyetang," or chicken and ginseng soup with sticky rice and garlic, at a restaurant in Seoul on July 16, 2020, this year's "chobok," the start of a 10-day period of hot

This photo, taken on July 16, 2020, shows commemorative medals during a publicity event in Seoul.

Lotuses are in full bloom at the Seooji-ri village in Hwacheon, 118 kilometers northeast of Seoul, in this photo provided by the county government on July 15, 2020.

A cook prepares "samgyetang" at a restaurant on Jeju Island on July 15, 2020, one day ahead of "chobok," the start of the hottest part of summer.

Tourists walk along the Philosopher's Path at Juknokwon bamboo forest in Damyang County, 344 kilometers south of Seoul, on July 14, 2020.

Takashi Matsumoto , a Japanese military attache at the Japanese Embassy in Seoul, arrives at the defense ministry in Seoul on July 14, 2020.

An Indo-Pacific bottlenose dolphin swims in waters off the city of Seogwipo on South Korea's southern Jeju Island on July 14, 2020. (Yonhap)
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Foreign students studying at Hansung University in Seoul eat "samgyetang" on July 13, 2020, three days ahead of "chobok," the start of the hottest days of summer.

A customer buys masks at a discount store in Seoul on July 13, 2020, one day after South Korea's mask ration system ended as the supply of face masks, designed to help fight the new coronavirus, ha

This photo, provided by the Red Cross in Busan, shows its volunteers doing recovery work in South Korea's southeastern port city of Busan on July 11, 2020, after some parts of the city were inundat