I tried to seek for support as much as possible and unfortunately I can never see my Ether back.
I intended to use a cold wallet right from the start but somehow I ended up with my etherwaller and got all my ether stolen.
I didn't bookmark the web but I don't think I entered the phising site either since I spent time to capture and read all the security guide on it before creating the wallet. After that I requested a support ticket on that site and got proper replied from myetherwallet support team. Then there's no way it's a phising site right?
I still can't understand the reason till now, so sad and shameful since I always take pride in my awareness about cyber crime and hacking tricks.

Still I wish that the wallet sites should ask for the second verification ( such as Google authenticator) before creating a wallet or forwarding a transaction, it's safer that way right? ( since a minor mistake will take all of your money without seeing it again, and I've seen several tragic cases like me across the Internet)

For the time being I accepted my loss and gotta more careful next time