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I'm not an expert on this, but it sounds like CapricornNoble down thread is :-)

If we assume Seoul is largely destroyed, the economic damage I'm thinking of comes from a few different places, not from the war going on but from the aftermath. Many people could die, causing both a loss of expertise and simple manpower. Housing would be destroyed, such that those that did survive would need emergency housing. The massive destruction of property would burn up trillions of dollars in real estate investment. And lastly, specialized commercial and industrial properties would be destroyed. I don't know to what degree Seoul is an industrial capital, but there's likely some of this at least.