In He-Gu's "vision replay," he quickly flipped to the scene he saw in the library, finding the segment where he leafed through the notebook.

Then, with a thought, the "vision replay" began to slow down, "replaying" the contents of the notebook.

The first thing He-Gu saw was the text on the first page of the notebook:

[It's too dull on duty here, so I'll jot down something to pass the time. Anyway, no one will see it. Writing something here shouldn't count as leaking secrets, right?]