Previous spikes in South Korea were linked to outbreaks at churches and protests. Health officials say the current wave appears to have no links to any major groups or events.
Women usually clean and cook at their in-laws' — but many stayed home this year. "It's difficult to understand why we have to do so much hard work when it's not even for our own ancestors," one says.
Pyongyang says an unidentified man was found in North Korean waters and that he murmured he was from South Korea but then stopped responding to soldiers' questions and appeared to try to flee.
The 47-year-old fisheries official, whose name was not released, apparently jumped off a patrol boat near the maritime border between North and South and floated into North Korean waters.
A clash over disease control between the government and a church is the latest flashpoint in a wider conflict between a right-wing coalition and President Moon Jae-in's liberal administration.
The storm expected to bring heavy rainfall and high-speed winds on Sunday. Authorities are urging residents of islands of Kyushu and Okinawa to exercise caution.
Mayor Park Won-soon's daughter told police he left a verbal message similar to a will, and later turned off his mobile phone. His body was found in a wooded park early Friday, police say.