Shen Zhao received anonymous white roses for three consecutive years, with the dates of old cases engraved on the stems. Forensic doctor Xie Yan calmly analyzed pollen for him, archivist Lin Qiuwu handed over vague surveillance fragments, and mysterious botanist Bai Rui was weaving a web of revenge using poisonous roses. When the fourth bouquet of flowers contained Xie Yan's old work badge, Shen Zhao realized that the murderer was not warning him, but completing the unfinished trial on his behalf.
