High School Mystery Class

Five students transfer to a girls' high school and are bewildered with accidents happening nonstop.

The members become prime suspects of a pizza theft and might be kicked out. Who is the real culprit?

The members take a sweet break. Then, a stranger hysterically presses on the door lock.

The first case request arrives at the Mystery Club. "I hear scary noises in the cafeteria everyday!"

The team finds a secret box at the library and discovers the school's ugly past.

The team hears creepy sounds like the note said. Is it a soul of a child who died at the school?

A mysterious suicide note is found in a dead friend's locker. "I don't think she committed suicide."

The team looks for a green pill after a weird phone call but gets in a fight and might split up.

The members fight with a former Mystery Club member. A new post is uploaded on In-hye's Instagram.

Members dig into In-hye's death. Then, an eerie signal arrives. "Murder... End.. Plan..."

Goh In-hye is alive! While following her traces, the members get in a breathtaking chase.

The school's conspiracy rises to the surface and the truth of Goh In-hye's death begins to unravel.

Someone attacks the members in the bunker. The iron door is tightly closed. Can they safely escape?

Members fall inside a huge maze with no beginning or ending while trying to save Goh In-hye.

Everyone has fallen asleep. The members have only one hour left to stop the brutality.