This is what my latest South Korean catalogue says
There are two types of 100 whans.
Type 1 - Serial number between 1 and 5 is extremely rare. This type is known as the Brown note;
Type 2 - is called white note
Issued between 1953 to 1962
Value
UNC 33,000,000 won
AU 18,000,000
XF 6,000,000
VF 3,500,000
F 2,000,000
G 800,000
I am not sure if the values are referred to the rare series or the not so rare one. There are other Korean text written and I have no idea what it means.