A beautiful high school student, who is the top student of her class, mysteriously dies. Six of her friends who graduated from the same elementary school attempts to track down the reasons for her death by communicating in real time. While the six friends dig for the truth behind her death, they face difficulties in their studies, dropping out of school, bullying and boyfriend troubles.

• Kim Bo-ra
• Yoon Hee-seok
• Hong Jong-hyun
• Lee Joon
• Park Ji-yeon
• Shin So-yul
• Jung Woo-yeon
• Go Kyung-pyo