"This diary belongs to So-young. "So-young Han, Junior, Homeroom 8." is written on the cover."
— Examine Text

So-yeong's Diary is an item in White Day: ALNS And Remake.

So-yeong leaves her diary on the bench in the courtyard of Yeondu High School on 13th March, 2001 on day time. Hui-min finds her diary and is trying to return it during the midnight (School curfew, 10:00 PM) along with a White Day Candy. The story of WhiteDay and the Yeondu High School Paranormal Incident occur on the same day.