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Hi 라이너,
I'm sorry to hear that you are having an internet connection issue. My name is Lee and I'll be happy to help!
To start with, may you please confirm the make and model of your computer to provide you steps that are specifically for your PC?
Also to save time, please include all the steps that you have tried already so we can skip those to save your time.
Thanks, I'll be waiting for your response.
~ Lee