In Xinhai City, memories can be read, played back, and even become the most conclusive evidence in court. "Deep dive" technology created an era without lies and gave birth to the most perfect crime. Former ace "Yi Jing" Shen Zuo went into self-exile due to a personal tragedy three years ago and lives with antique clocks all day long. However, a series of unexplained "perfect suicide cases" dragged him back into the whirlpool. The memories of the deceased clearly showed that they volunteered to die, but the minor abnormalities at the scene could not escape Shen Zui's eyes. He must return to the deep sea of memory that he vowed never to set foot in, and fight against a ghost killer who can tamper with thoughts and implant despair. In this chase, Shen Zui not only has to uncover the truth, but also faces the most painful memory cage of his own.