A text message arrives from a dead friend. Since then, mysterious cases take place in a high school, which are intricately tangled with each other. Five mystery club members get together to reveal the truth of the mysterious incident at school.
| Creator | Jeong Jong-yeon |
|---|---|
| Actor | Park Ji-yoon, Jang Do-yeon, Lee Eun-jae |
| Country | South Korea |
| Production | CJ ENM |
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