The link is incomplete because they wanted to hide it from the Chinese users. Didn't you notice that one character was missing from the link? They gave a hint in Korean, which I don't understand. I do know that it's a Base64 link.
Here's an example of a complete link:
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This is the one they provided from Base64:
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"Malformed URL The requested URL is malformed."
Let's say we add a 'G' at the end:
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"Collection Not Found The requested collection is not exists or expired."
What do you think? They're hiding it from anyone who isn't Korean.