Diary of June (Korean: 6월의 일기; RR: Yuwolui ilgi; also known as Bystanders) is a 2005 South Korean mystery thriller film starring Shin Eun-kyung, Yunjin Kim and Eric Mun.

[2][3] The film was released to South Korean cinemas December 1st, 2005 where it received a total of 697,980 admissions nationwide.

Suspecting the possibility that a killer is at the same school, detective Chu Ja-young (Shin Eun-kyung), with her rookie partner Kim Dong-wook (Eric Mun) search the school to find identical handwriting that matches that of the diary excerpts.

When they finally find the matching one, they're told that Jin-mo, the student who wrote the text, had already died in a car accident one month ago.

As Ja-young and Dong-wook discover Jin-mo's secret diary, more clues are revealed concerning the next victim.