Zhen Yu receives an anonymous package, suggesting that there is a hidden story behind the explosion that killed his father Zhen Jiangming fifteen years ago. The clue is hidden in a hidden area in a game called "Detective". Zhen Yu immediately enters the game and meets the mysterious girl Bei Chen, the eccentric Dong Ning and the optimistic Jia Xiaofei. The four of them have found some mysterious clues related to themselves in the case, and the truth is becoming more and more confusing.