Yoon is starting his single five-year term during one of the most challenging situations of any recent new president, facing a mix of significant security, economic and social problems that are besetting the world's 10th largest economy. There's widespread skepticism that an increasingly belligerent North Korea will give his offers much consideration, and South Korea's deep political and social divides, as well as growing worry about the state of the pandemic-hit economy, are reflected in a recent poll showing that Yoon faces lower popularity numbers than the departing liberal president, Moon Jae-in.