I want to change my phone number by changing my phone number in my profile... 프로필에서 핸드폰 변경해서 핸드폰 번호를 변경하고 싶어요...

This translates as:
Razer ID: thxdevil4
Email address associated with Razer ID:
Date of Birth:
Name:
Phone Number:
New Phone Number:
Country: Korea 

(Removed personal information for security)

Hello thxdevil4,

The Razer Insider doesn't have support for your preferred language. Please post your inquiry or concern in English across all boards.

I have verified your information and successfully removed your old phone number from your Razer account as an Authenticator. I suggest setting up a new one to secure your Razer account by following the steps below:

1. Log in to your Razer ID account.
2. Select 2-Step Authentication under Security.
3. Enter the code sent to your Razer ID email.
4. Set up your preferred 2-factor authentication method.

Or you may enable an authenticator App for Razer ID. Here is the Link for the guide.  Let me know if that works for you. If there's anything else you need, feel free to PM me. All the best!

*Thread locked to curb the conversation to PMs.