Strange rumors start to spread at the catholic girls' high school after Unjoo commits suicide one night. Unjoo's younger sister Jung-un, who attends the same school, gets suspicious about Unjoo's death. After persistent investigation, Jung-un finds out that on the night of the incident, Soy, Eugene, Eun-young, and Unjoo tried to commit a joint suicide after making a vow on blood. But the other three are still alive...
The desire, jealousy, and lies behind the pledge of death between the four girls are revealed, along with the hidden truth behind Unjoo's suicide.
Spoken Languages: English, Korean, English subtitles.