What does the eight-character year mean?

Simply put, any evil spirit will fail in this place. If there are bad evils in your life, this will be good. If you have good evil spirits, I'm afraid you won't be lucky (or unlucky) here.

Yes, the good luck or fleeting time you mentioned is one of them. Not only that, even the immortals and evil spirits in the life stage can be avoided, if there are any ~ ~