This short article, I believe, hits the nail on the head, explaining the reasons

why South Koreans, especially students and their hard working parents, are so mad

at their President Park who let Choi violate the sacred cow, the unwritten traditional, golden rule,

the fair play at college entrance examination.(all of us had to go through the gate so we all know)

Of course, that was the tip of iceberg of the huge scandal that was revealed afterwards.

https://www.washingtonpost.com/world/asia_pacific/south-koreas-political-crisis-could-become-a-trigger-for-bigger-change/2016/12/06/d1c7f50c-c082-404e-a6e5-b6af0bcaffcd_story.html?ref=yfp&utm_term=.753bdfb5bbbe