In a seemingly ordinary classroom, a haunting melody triggers a series of mysterious deaths, leading to a gripping investigation that intertwines music, murder, and a dark secret....

In a small vocational high school, a silent witness holds the key to a dark and hidden truth, and a killer is lurking in the shadows....

When a teacher's sinister revelation about a student's past becomes a silent witness to a classroom murder, a gripping tale of secrets, lies, and a race against time unfolds....

In a classroom shrouded in fear, a teacher's sinister scheme unfolds, leading to a chilling murder mystery that intertwines the lives of the students and reveals a dark secret hidden within the walls of Longqing's Classroom....

In a seemingly ordinary school, a series of mysterious poisonings rocks the class, leading to a chilling revelation about the true nature of their teacher....

A teacher's dark secret is exposed when a student discovers a tragic past, leading to a chilling murder and a quest for truth in the heart of the urban jungle....

In a seemingly perfect classroom, a dark secret surfaces, leading to a chilling game of deception and survival....

In a quiet classroom, a deadly secret festers, and a single witness holds the key to a chilling revelation that will rock the lives of all involved....

In a prestigious high school, a series of mysterious deaths shroud the campus, intertwining with a hidden political intrigue, as a teacher becomes the silent witness to a deadly game of cat and mouse....

When a seemingly ordinary teacher assigns a homework assignment that leads to a deadly chain of events, a student's betrayal and a teacher's dark secret are revealed in this gripping tale of mystery and intrigue....