Korean Political History II: Chapter 5, Exercise 1 — Possible Solution
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ROUTE
1961: joins the Workers' Party and rises through propaganda ranks.
1980: designated successor at the Sixth Congress.
1994: becomes supreme leader on his father's death.
1997: named General Secretary of the Workers' Party.

UNEXPLAINED
The interval from 1994 to 1997: the source does not say what formal titles
he held or why the party post came later.