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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.
First Air Date : Jan 29, 2021
Last Air date : Jun 07, 2024
Episode : 32 Episode
Season : 3 Season
Runtime: 40 minutes
Studio: TVING
Country: South Korea