The suburban wasteland where blue iris blooms is the solitude of former detective Duan Yichun. The tragic scene of the sacrifice of his comrades in a major case three years ago turned into a psychological trauma that was difficult to heal. He was transferred from the front line of criminal investigation and worked as a publicity post at a grassroots police station. He deliberately avoided all crimes and lived in a closed mind.
Hot-blooded newcomer Wen Yi'an joins the police force with dreams of becoming a police officer, and accidentally glimpses Duan Yichun's loneliness hidden under peace. There have been a series of mysterious missing cases of women living alone in the jurisdiction. Everyone regarded it as an ordinary family matter, but Wen Yi'an discovered that there were many doubts.
The murderer replayed the old case and placed iris at every scene to deliberately defeat Duan Yichun. The young man's persistence breaks the veteran's reclusive mentality, and the two work together to investigate the case and heal and redeem each other.
The truth of the decisive battle on the rainy night was revealed, and the crime came to an end, but Wen Yi'an was forever frozen in the cold night. The iris blooms as scheduled every year, and Duan Yi'an, who has emerged from the gloom, returns to his job as a criminal investigation, leaving him alone to remember this side-by-side past.
Concept: This work uses the iris as an emotional symbol to tell the story of an old detective who is burdened by the trauma of an old case and a new police officer who is full of ideals, who redeem each other, work together to solve repeated murders, and ultimately use life and death to interpret the story of the inheritance of police beliefs and redemption that are destined to leave regrets.