Reddit reviews Korea's Development Under Park Chung Hee (Routledge/Asian Studies Association of Australia (ASAA) East Asian Series)

Hey I have quite a few books from that period that could help you!
The first is Elites and Political Power in South Korea.
If you want a book about the Park Chung-Hee period and the elites at this time maybe read Korea's development under Park Chung-Hee.
If you want to read about the elites and political climate during the democratisation period perhaps read From transition to power alternation..
Finally if you want a book that discusses the general climate and to see how elites are viewed give Democracy and authority in South Korea a read.

Hope this was helpful :) Sorry if the books are a bit expensive...I got them free from my library so I didn't realise how much most of them cost. You said you wanted detailed analysis and these are very detailed.

Edit: Just wanted to add it is a very interesting period and topic, I read alot about it myself if you couldn't tell ;)