Hello, Mr. Kim
Although it is the affair inquired,
it can reserve from overseas to the following sites.
http://www.world.eki-net.com/
However, HOKUTOSEI and CASSIOPIA sleeping-car,
typeA1,A2andB1,B2 cannot be reserved.
Moreover, it is difficult for ordinary Japanese to also reserve at this time.
(because in Sapporo snow festival)
How about asking a travel company detailed on the railroad travel of Japan in South Korea?

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