After Dressing up as a Cannon Fodder Female Assassin, I Didn't Dare to Take a Single Blow.

The overall rhythm is a steady flow of daily advancement + periodic ups and downs of intrigue. The emotional line is "ambiguous" throughout the whole process. The female protagonist never confesses the identity of the killer, but the male protagonist always knows it but never reveals it. This tacit line runs through the whole book, and it is not until the final chapter that he is forced to clarify it at the critical moment of life and death.