Could not login to admin panel

Hello,

I have this site running completely fine http://theweddingcompany.com.sg Then all of a sudden we could not login to the admin panel, giving us the error invalid username and password. None of us changed the password.

I would like to decrypt the password from database if possible, to check if it’s still the same as previously but I tried many MD5 decrypter but they could not decrypt the password. Anyone has any idea how to decrypt the password?

Anyone had this issue before? The contents are messed up as well, line breaks went missing, some plugins break.

Thanks for your input!