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![People rest by the water along Cheonggyecheon in central Seoul on May 18, when daytime temperatures climbed to around 30 degrees Celsius (86 degrees Fahrenheit) across much of the country. [YONHAP]](https://image.koreajoongangdaily.com/12576084.jpg?imageId=12576084&width=240&height=184&format=webp&format=jpg)