SEOUL—Wearing a dark suit and red tie, Yoon Suk-yeol, the main opposition party’s candidate for South Korean president, stared into the camera with a stern look in his eyes. He prepared to answer a question: If he had to save President Moon Jae-in or the ruling party’s nominee from drowning, whom would he pick?
“I am AI Yoon Suk-yeol,” he begins his response, thanking the questioner in a video posted online. He paused a moment before finishing his thought.
