Korean Political History II: Chapter 4, Exercise 1 — Possible Solution
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FORMAL                                   REAL AUTHORITY (per the source)
Constitution: "dictatorship of people's  Workers' Party General Secretary
democracy" led by the party
Supreme People's Assembly (nominal)      Politburo, Secretariat
State Affairs Commission (2016)          Central Military Commission
                                         Kim family, "Eternal" titles

CAUTION
The source does not describe the powers of the Assembly or how the party and
state bodies interact.