A story that follows three children from a coastal town who unintentionally film a murder scene. As the kids become involved with the suspect, it opens up a case that is far more complicated than it looks and entraps several families into an unpredictable outcome.

The 12-episode series follows Wang Xiang, an ex-train driver who had worked his whole life at the steel plant in a fictional small town in North China, as he attempts to solve the mystery behind a brutal murder during the autumn of 1998. For more than 20 years, the murder has haunted him and other people who worked at the steel plant as they struggled to come to terms with the loss they’ve experienced.