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A South Korean government official communicates with a North Korean officer during a phone call on the dedicated communications hotline at the border village of Panmunjom in Paju, South Korea, Wednesday, Jan. 3, 2018. North Korean leader Kim Jong Un reopened a key cross-border communication channel with South Korea on Wednesday, another sign easing animosity between the rivals even as Kim traded combative threats of nuclear war with President Donald Trump. (Yonhap via AP)
A South Korean government official communicates with a North Korean officer during a phone call on the dedicated communications hotline at the border village of Panmunjom in Paju, South Korea, Wednesday, Jan. 3, 2018. North Korean leader Kim Jong Un reopened a key cross-border communication channel with South Korea on Wednesday, another sign easing animosity between the rivals even as Kim traded combative threats of nuclear war with President Donald Trump. (Yonhap via AP)

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    The hotline linking North and South Korea

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The hotline linking North and South Korea

CNN's Paula Hancock explains the complicated relationship between North and South Korea, from why the countries split to the telephone line that links them.

The hotline linking North and South Korea

CNN's Paula Hancock explains the complicated relationship between North and South Korea, from why the countries split to the telephone line that links them.