"The imposition of emergency martial law comes as Mr Yoon's approval rating dropped to 19% in the latest Gallup poll last week, with many expressing dissatisfaction over his handling of the economy and controversies involving his wife, Kim Keon Hee."

Hmm. The leader also seems to come from a party that has a minority in Parliament. So it appears like a very unpopular president, with a minority party in government going authoritarian to do... something?