json파일로 로그인하는거 선택했습니다.

이미 시도해보았습니다. ㅠㅠ

Many users reported about lost passwords or Ethereum-Wallet not accepting their password.

Please verify the following:

update to the latest version (link)
make sure the keyboard-layout is correct
no caps-lock is active

대소문자 구분 하셨는지 생각해보시고 최신버전으로 일단 업데이트 해보세요 ㅜ.ㅜ 너무 큰돈이네요

당시에는 십얼마밖에 안해서 그리신경안썼는데
이리 큰 돈이 되버렸군요

더 해볼수가 없네요 눈물... 

이까지 시도해주셔서 감사합니다.
저도 다.해봤어요

그냥 두개다 비밀번호가 틀렸다는 의견도 있고 그렇네요 ㅜ.ㅜ

If all three of those systems are giving you a bad password error, than something is wrong with your password, not their implementations.

The reason that you're seeing that second error on myetherwallet is that the password you're using is decrypting to a secret key, but not the one that's associated with the information otherwise in that json file. It's an uncommon but not unheard of error with the v1 wallet format.

One option would be to decrypt that incorrect secret key and see what wallet it's connected to, but it's highly likely the answer is still "you have the wrong password for your pre-sale account".

One thing to make sure before you go any further, is if the password you wrote down fits the specs of a pre-sale wallet password. They were:

greater than or equal to 8 chars
at least one of of each:
uppercase
lowercase
number
symbol
no inclusion of strings from a dictionary of most frequently used passwords
You might want to hit your pre-sale wallet with a password cracker and see if you can open it up that way. https://github.com/burjorjee/pyethrecover is a popular one, but there are a few out there, some of which are forks of this project.

If you're looking for wallet-cracking-as-a-service, Dave at https://walletrecoveryservices.com/ has a good reputation around here and is usually pretty quick to tell you if he think's he can get in or not.

And quite shamelessly, cracking-as-a-service is an area I'm looking to move into as a side project. I'll be the first to admit I don't (yet) have his infrastructure or track record, but I would be interested in taking a crack at it for a bounty. PM me if you wanted to talk about that.

질문은
I have tried importing my pre-sale wallet in Mist, myetherwallet, and ethaddress.org; all tell me my password is incorrect. What is interesting is myetherwallet gives me two different error messages, for what I think should be the correct password I get "Error: decoded key mismatch - possibly wrong passphrase" and if I put in a password I know is incorrect I get "Invalid password. Error: unable to decrypt data". My password has special characters and spaces, would that affect it? I wrote down my password when I created the wallet back at pre-sale. Any possible solutions other than I wrote down the password wrong, or didn't enter what I thought I entered?

였네요. 비밀번호 다른거 생각나시는거 있으면 더 쳐보시는게 좋을듯 싶습니다. 화이팅~~~ 꼭 찾으시길 바랄게요 2800만원 ㄷㄷ