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As for Kim Jong-un, first of all, he tried to kill his half brother in 2012, and according to South Koreans, the half brother, Kim Jong-nam actually wrote a letter to Kim Jong-un pleading with him not to do that anymore.

Source: www.msnbc.com
As for Kim Jong-un, first of all, he tried to kill his half brother in 2012, and according to South Koreans, the half brother, Kim Jong-nam actually wrote a letter to Kim Jong-un pleading with him not to do that anymore.