Important Notice Added

First of all, thank you all for your blessings and concern.

I have been off for so many days, and I should report that I am safe, but unfortunately, there is no safety to report.

I will try to write something tomorrow, but I guess it is still a long way from normal updates.

I will try to enter the unstable update state first.

This book will not be abandoned, please rest assured.

I just need some time to digest it.