Photo taken on Aug. 8, 2020 shows the flooded Banpo Hangang Park in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows the flooded Jamsu Bridge, the lower deck of the Banpo Bridge across Han River, in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows a mud-covered rest area at the flooded Banpo Hangang Park in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows the flooded Banpo Hangang Park in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows the flooded Banpo Hangang Park in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows the flooded Sebitseom, a famous tourist spot by the Han River in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)

Photo taken on Aug. 8, 2020 shows the flooded Jamsu Bridge, the lower deck of the Banpo Bridge across Han River, in Seoul, South Korea. South Korea's death toll from heavy rain, which continued since last Saturday, rose to 21, with 11 missing and seven wounded as of 6 a.m. local time Saturday, according to the Central Disaster and Safety Countermeasure Headquarters. The torrential rain spread from the country's central region, including Seoul and its surrounding metropolitan area, to the southern region Friday. (Xinhua/Wang Jingqiang)