Thank you for your reply.
I successfully got my eos tokens in my MEW.
But I am still concerned because I registered my private key on the "contract" page.
Would there be any problem on it? or do I have to change my eos public key?
I saw someone who lost all eos tokens, probably because he registered private key on contract.
Please let me know if you have any opinion.
You registered your EOS private key? Please regenerate a keypair, and the update your EOS key then. No harm is done as long as you update this before June 3rd 2018 and NEVER use that EOS keypair again.