After Passing Through the Book, the Junior Sister Does Not Play According to the Routine

After traveling through eighteen years, Shen Ning discovered that he had actually traveled through a novel he had read, and was a passerby who only had a name. They said it was a destiny book, but when Shen Ning came, the gears of fate had already begun to turn. The effect is the cause and the cause is the effect. It is the creator of the result and the promoter of the cause.