Korean Political History I: Chapter 9, Exercise 1 — Possible Solution
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EXECUTIVE: a president serving a single five-year term, directly elected.
LEGISLATIVE: the National Assembly, 300 members on four-year terms, 253 from
single-seat constituencies and 47 by proportional representation.
JUDICIAL: a Supreme Court and a Constitutional Court, described as
independent of the other branches.

CAUTION
The source gives no figures for the courts, so none are stated.