Moon Jae-in set his mind on South Korea’s presidency nine years ago, when his ailing role model, Nobel Peace Prize-winner Kim Dae-jung, pulled him close and urged him to keep fighting for peace with North Korea. Soon after, Kim, the first South Korean leader to visit Pyongyang, was dead.
Moon found himself among a core of acolytes determined to preserve Kim Dae-jung’s “Sunshine Policy” toward North Korea. The ex-president’s plea rang in Moon’s ears, even as the latest U.S.-led efforts to disarm the regime and end their unfinished war unraveled.
“That was the decisive moment,” Moon told a group of

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