An ambitious professor of psychiatry, Viktor Meshchersky, conducts a dangerous psychological experiment in which, under false pretenses, he locks victims and their abusers in the basement, hiding his true goals. The subsequent investigation will reveal the real motives of the professor, and will tie together the confusing stories of all participants in the cruel experiment.
Aspiring director Nikita receives a fatal diagnosis. He has very little time left to live, so he invites three of his classmates on a challenging journey he had planned ten years earlier. This adventure, intended as a nostalgic return to his carefree school years, turns into a serious challenge, pitting the heroes against the harsh Ural nature, a bloodthirsty local poacher, the Mansi tribe, and a sinister old man responsible for the disappearances.
A murder occurs at a party hosted by Dr. Aida's former students (mostly women), most of whom live in Kanagawa Prefecture. Dr. Aida is invited to the party and, at the request of his former students, decides to become involved in the case. Soon after, detectives from the local police department arrive (always accompanied by the chief of police), and a little later, Lieutenant Suda from the Fujisawa North Police Station (now the Yokohama Port Police Station) arrives to begin questioning the people involved (Dr. Aida secretly overhears this). The murders continue and the case becomes more and more confusing. Dr. Aida gets hints from the tools of the ancients that he has unearthed, and unravels the trick that was used to commit the crimes. The birth secrets of the people involved are the key to the case, and Dr. Aida (or Suda) always visits the obstetrics and gynecology clinic in the interview scene in the middle of the story.
Ma San, the heir to a mystical tailoring craft, uses his unique skills to save lawyer Song Yuan from a life-threatening ordeal. The duo teams up to unravel strange cases and deliver justice.
A detective in the major crimes division of Nanxing City Police Department, together with a woman who has super memory, upholds the law one case at a time in solving murders, and burglaries and bringing down a narcotics manufacturing facility.
Hyuk-joon, a debt-ridden young man, joins the mysterious Spyder Human Resource Center lured by unusually high wages, only to encounter bizarre phenomena. As strange events unfold, accident investigator Yeon-joo begins digging into the company's secrets, while Hyuk-joon's sister Ji-yoon grows increasingly concerned for him.
A genius doctor named Yuichiro Nozaki comes to a hospital to know the reason of his sister's death. The doctor is wondering if someone of the hospital killed her. Finally, Yuichiro finds doctor Katsuhiko Sonobe is a suspect of the murder, but notices Katsuhiko's wife loves Yuichiro.
Shen Yan, a detective, teams up with unlikely allies to solve a series of murders linked to stolen sacred artifacts. As they follow a trail of clues, they uncover a decades-old mystery that holds the key to stopping the killer.
Huge mansions have heinous secrets. As clandestine family ties, scandals and uncanny deaths spiral around the dark hallways of Indu's home, she leaves no stone unturned to untangle the mystery.
Tanya makes a death wish on a dare app sets off a dangerous game of blackmail and violence. As her loved ones become targets, she must race against time to unmask the 'Knock Knock' Killer before it's too late.
A cold case resurfaces in 1996 Yokohama when a respected tutor's unsolved murder reignites investigation into his troubled former student, uncovering hidden connections between the victim, suspects, and seemingly unrelated individuals that twist the mystery into unexpected directions.