A bit more information from the NY Times article:
https://www.nytimes.com/2020/07/09/world/asia/seoul-mayor-de...
> His disappearance came a day after a secretary in the mayor’s office told the police that he had been sexually harassing her since 2017, two Seoul television stations reported, attributing the information to unidentified police sources.
> Mr. Park, 64, had canceled his official schedule for Thursday and called in sick to City Hall. His daughter told the police that he had left home after leaving a cryptic, “will-like message,” according to Yonhap, the national news agency, which cited an anonymous police source.
> When Mr. Park had not returned home after five hours, his daughter called the police.