Cold Case: Fatal Bus

A bizarre incident occurs when passengers on a bus collectively commit suicide. Forensic expert Jian Yao's younger sister is among the dead. To uncover the reason behind her sister's suicide and the truth of the case, Jian Yao begins an investigation. However, the survivors start dying one after another, and even her parents seem to obstruct her search for the truth. Just as the video containing the truth is finally revealed, something unexpected happens.