Korea has a monsoon season every year in the summer time. This year's monsoon season started relatively early, and it has been continuing now for approximately 6 weeks. That is a lot of rain for just one season.
Last night it rained extremely heavily in Seoul, and today the streets are flooding. Some bus routes have been closed. A substantial number of houses and buildings have been damaged by excess water. The rain will not stop till Friday, which will make transport incredibly difficult to use. Be careful ! 조심하세요 !!