This expression comes from the lyrics of the song "Li Qixiang" by Jay Chou, a singer in Taiwan Province Province, China: "You appear on every page of my poem, and my love overflows like rain all night". This song is one of Jay Chou's masterpieces. It was released in 2000 and is still popular today.
The expression "You are every page in my poem" compares someone or something to every page in the poem, which means that this person or thing is very important and precious in his own life. At the same time, this expression also has a romantic and beautiful emotion, which can make people feel warm and moved.