Your comment almost reads like satire. The whole point of the article was to show the dystopian insanity of what a society hell-bent on competition at all costs looks like. High school kids in school 14 hours/day competing against each other for limited slots at top schools, and then competing against each other for limited slots at companies where they work 14 hours/day for low wages. Life satisfaction ranked among the worst and suicide rates the highest in the world. Blatant discrimination on physical attractiveness (hence highest rates of plastic surgery) and parental occupations is icing on the cake.
And you're concerned that addressing these issues might make the economy less competitive? That mindset is exactly the problem this article is trying to highlight.
We completely neglect happiness, and maybe we're all competing for the wrong things.
Open to alternative solutions than UBI, but I don't see anything else that's going to have a significant impact on fixing South Korea's situation.