The most important one is the introduction to Headache. You can read it if you want. If you don't read it, you'll be disappointed. If you read it, you'll be given points! Don't scold me, don't say my writing is bad. I put in the effort to write it, but you have the right to choose not to read it. If you scold me after reading it, you'd better save some effort! I didn't make it into the rankings last time, which has always been a pain in my heart...
The theory of relativity in life is that people are more irritating than others. On the contrary, there are always people who are unhappy than you, so be content!