The new old war in Korea

[Delc]

According to Wikipedia list of Armies SK isn't in the top 5, may not even be in the top 10 with respect to active forces (although they do have 3 million reservist, but NK had 4.5 million reservists). Now, the big question is, what percentage of SKs reservist are in the vicinity of Seoul? A potential artillery first strike could severally degrade SKs reservist forces if enough of them are in the Seoul metropolitan area.

South Korea is 8th on that list, but I think you overestimate the value of numbers. From a numbers standpoint the Iraqi military was as strong as the force that invaded in 2003. It took 6 weeks for them to be utterly crushed (and by some estimates, decimated). Technology and training mean a lot more than soldier count. Zerging an opponent takes a lot more than a 3:1 numbers advantage. Using the invasion numbers from Iraq, they would need something like 174:1 to be successful.