People mourn the death of Seoul Mayor Park Won-soon in Seoul, South Korea, on July 11, 2020. The 64-year-old mayor was found dead in the woods of Mount Bugak near his residence around midnight Friday local time. No sign of foul play was found, but the police was investigating the exact cause of his death. (Photo by Seo Yu-Seok/Xinhua)

People mourn the death of Seoul Mayor Park Won-soon in Seoul, South Korea, on July 11, 2020. The 64-year-old mayor was found dead in the woods of Mount Bugak near his residence around midnight Friday local time. No sign of foul play was found, but the police was investigating the exact cause of his death. (Photo by Seo Yu-Seok/Xinhua)

People mourn the death of Seoul Mayor Park Won-soon in Seoul, South Korea, on July 11, 2020. The 64-year-old mayor was found dead in the woods of Mount Bugak near his residence around midnight Friday local time. No sign of foul play was found, but the police was investigating the exact cause of his death. (Photo by Seo Yu-Seok/Xinhua)

People mourn the death of Seoul Mayor Park Won-soon in Seoul, South Korea, on July 11, 2020. The 64-year-old mayor was found dead in the woods of Mount Bugak near his residence around midnight Friday local time. No sign of foul play was found, but the police was investigating the exact cause of his death. (Photo by Seo Yu-Seok/Xinhua)