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.

Release : January 29, 2021

Website : https://www.tving.com/contents/P001433241

Total Eps : 32 / 40 minutes

Total Season : 4

Rating : 8.70