Kim Jong Un was an unknown quantity when he succeeded his father in 2011, and he remains an elusive figure.

North Korean leader Kim Jong Un listens during the congress of the ruling Workers’ Party in May 2016.
North Korean leader Kim Jong Un was an unknown quantity when he succeeded his father in 2011, and he remains an elusive figure.
North Korea tightly controls any information surrounding its leader, who is treated almost like a deity there, and gathering intelligence out of the country is notoriously difficult.
The United States is monitoring intelligence that Kim is in grave danger after undergoing a previous surgery, according to a US official with direct knowledge.
Kim recently missed the celebration of his grandfather’s birthday on April 15, which raised speculation about his well-being. His absences from official state media often spark speculation and rumors about his health.