The rise of Kim Jong-un's closest aide and why it matters to the U.S.

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With the U.S. seeking to reboot denuclearization dialogue with North Korea, there have been some developments in Pyongyang that could affect who Washington will have to deal with. Speculation has surrounded the rise of a North Korean official dubbed the leader's "shadow" - including the possibility of him taking up the new "first secretary" position within the ruling Workers' Party. Find out who this "shadow" is and why it matters.

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