The setting of "time and space travel" where the male and female protagonists share the same soul. During the day, the male protagonist Qin Yanzhi controls power in 1915 during the day; at night, the female protagonist Shen Qingque seeks revenge in the broken time and space six years later in 1921. The two exchange information through a "blank secret book" - the words written by the male protagonist during the day can be seen by the female protagonist at night; the cause and effect planted by the female protagonist will manifest as a butterfly effect in the male protagonist's timeline. The core counter-routine is that the avenger and the avenged are the same person - "he" must not only prevent "himself" from making a big mistake, but also must solve the dilemma created by "himself".
