What makes you think that the South Korean Pres asked?
"Mr. President.... there's a guy out here in the waiting room. Been here since 5:30am and says he won't leave until you see him..."
I think this is a grey area as far as the Logan act is concerned.
Obama needs to go to prison. But it will never happen because pols are too afraid of potential violent reaction.
“The Korea Herald reported that Moon spoke about his recent meetings with President Trump in Washington and asked Obama for his advice on how to improve that relationship.”
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The Korea Herald says Moon “asked Obama for his advice...”. Is the Korea Herald fake news?