Hi taehul,
I've been looking into this since this afternoon. The example you gave earlier, is that a real generated "false" key, or just some bogus data? It contains an "O", which is an invalid character for Base58.
As for the 0x90 instead of the 0x80 in the start, I'm not sure where that came from, but it is an unneeded prefix for the type of key as stated in
https://en.bitcoin.it/wiki/Wallet_import_format (WIF to private key, point 4).
What I would do, is make a backup from your auroracoin-qt wallet (wallet software shut down) and follow the steps in the link above to generate the private key and try to import that. See if the transactions show up (or you'll have to rescan the block chain to show them up).
Please let me know how that goes and document the steps.