First, they require me to upload a photo within a personal ID by email and mention that the DNS would be affected if I don't upload the photo.
Second, I tried to transfer my domain out but there is on way to do that by myself. They don't provide the service in their web site. And they still require my to send a mail which include a hard copy of my personal ID and an additional paper form to their office. And they won't pay the fee of the mail.
Third, I made a phone call to their service centre. They told me the only way to transfer my domain out is to fill the additional paper form and send it to them with a hard copy of my ID. They had nothing to do.
Last thing is they never mentioned these above until I tried to transfer my domain out. Which means I was informed 5 years later after my first payment for my domain.
So at last, I try to get my auth-code through ICANN. The address of complaint page is below:
Hope this could help anyone who has the similar trouble with me.
Be away from these terrible registrars.