Fortune Telling Collection - Free divination - In episode 126, how did Liu Xing know the identity of September Day? When did it begin to know?

In episode 126, how did Liu Xing know the identity of September Day? When did it begin to know?

126 No one came out of Liu Xing, but if he knew fortune-telling at the age of 42 (this is the last point of "the night is still early"), he would recognize it.

The fortune teller said to him (Liu Xing)

"The September wind blows gently, which is the taste of love, but I don't know that I am by your side! Dangerous task ... "

Give some points.