I just bought a D300s digital camera in Seo...

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Assuming this is Nikon. The D300 has a US manual that you can find here:

http://support.nikontech.com/app/answers/detail/a_id/16525/kw/d300s/r_id/116678

You can't print this out unless you enter your serial number, so I'm not sure if your camera bought in Korea will qualify. But this will let you look through it all you want online.

Also look here for some good suggestions on the D300 and other Nikons.

http://www.kenrockwell.com/nikon/d300s.htm
www.kenrockwell.com