Figured it out
That 'An "Mu" Su' is a pirated account; he is actually Yanyun Eighteen Riders (-_-///), and his real account seems to have been hijacked. But it's okay, you just need to resend the registration SMS once. The password will automatically become the last six digits of your phone number, and you must change the password after logging in!! I don't despise account hacking (I hack accounts myself and get excited, but I usually still…)
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Being victim to SIM swapping and then having the person who swapped the number use it to mess around? I strongly despise it; it reminds me of 'fools'.
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