Ahem, first of all, it's not a kidney's problem......

Secondly, this volume is a complicated interpersonal relationship, and I am still thinking of a good starting point, and I have been busy lately and have not found much time to write.

Thank you for your understanding and patience.

"The Devil's Exam Paper" has been busy lately, and it is not in good shape It is being hit by hand, please wait a moment,

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