South Korean policy after NK collapses in the 1990s

Many people believed North Korea was going to collapse in the 1990s, and be annexed by South Korea. Let's say they do collapse, and South Korea picks up the pieces. What is South Korea's policy with the former North Korea?
 
I suspect they would run the northern provinces separately and keep the border or face mass migration to the south.

Then invest in infrastructure, education and light industry I would think.

There's actually a shadow cabinet for the north that has been run for decades by southern public servants. I can't remember its name right now, but I assume they have planned for the contingency.

EDIT: https://en.wikipedia.org/wiki/Committee_for_the_Five_Northern_Korean_Provinces

and of course the https://en.wikipedia.org/wiki/Ministry_of_Unification
 
The ROK would have its hands full running the north or former DPRK not to mention coming to a gentlemen's agreement with the PRC on a border zone at the Yalu and with the US on either withdrawing its troops at long last or keeping some on the Korean peninsula in order to "show the flag" ("If any of you get out of line, you know we are still here") and also keep any local Koreans employed with the US forces ( Jobs, ya know).
 
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