Korean Political History II: Chapter 8, Exercise 1 — Possible Solution
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PRECISE DATES
9 Dec 2016: Assembly votes 234 to 56.
10 Mar 2017: Constitutional Court unanimously upholds.
9 May 2017: election won by Moon Jae-in.

MONTH OR YEAR ONLY
April 2018: 24-year sentence (later 25).
December 2021: pardon.
March 2022: release.

CAUTION
The source does not say when the sentence was raised to 25 years.