Serious Case No. 0, Specializing in unsolved cases.
Captain Jiang Yi has not missed a beat in seven years.
Until the body with no wounds appeared.
A cut off finger, a wintersweet.
Five dead people, a revenge spanning fifteen years.
Ruan Qingci said: "This is not murder, it is sacrifice."
Su Nian said: "The technology used by the murderer came from acoustic experiments thirty years ago."
Lu Zhiyu said: "There are always people watching around us."
Jiang Yi found out at the end——
Behind every unsolved case, there is the same name.
Red maple bone farm, sound nest organization, infrasonic weapons, binaural puzzle...
All the threads point to a man who has been hiding in the shadows for thirty years.
And the only one who can hear the truth,
Still waiting to be found.
