General Park successfully seized control of Seoul in the pre-dawn hours. Victorious, he posed for photographs that very day in front of Seoul City Hall:
Here it is today. See the same doors?
But why did they make the New City Hall such a weird shape?
A tidal wave of futuristic fury, splashing over the dusty-looking old City Hall. That's how it looks to me. I interpret it to be meant as a metaphor for South Korea moving into a new world, washing away its historical "baggage" of War, Dictatorship, Terror, Foreign Occupation, and Economic Misery. Those are things that Koreans feel defined the majority of the period during which that stone building served as City Hall. All have been washed away by the unstoppable tide of Korean progress and advancement towards status as a global leader (...is the idea).
Certain angles make this "tidal wave" visualization very clear: