Eleven years ago, the boy Mei Man hanged himself from a banyan tree at the Guangzhuo juvenile detention center in the Dragon Kingdom. The police hastily closed the case as a suicide following failure in the college entrance exams. Eleven years later, Liu Qiang, his terminally ill father, storms into Guangzhuo with a knife and takes hostages, all to force the police to reopen the case. At the same time, the young woman Xiong En'en sees a charred severed hand in a sleepwalking episode. A good-luck charm, a burned-out surveillance room, expired hallucinogens, and a scrapped hard drive follow one after another. The clues point to the detention center's psychologist, a female officer, and its director, ultimately uncovering a dark web that has been entrenched for years.
The daughter of Xin Bai, a hero of the Dragon Kingdom's space program, mysteriously falls to her death at school. He makes an unauthorized return to Earth and is captured by the Dragon Security Bureau, the Dragon Kingdom's security agency. After learning that Kong Xingyue, the killer, has gone unpunished, he escapes under cover of dense fog and infiltrates the rear mountain to take revenge.
Wang Cheng, a former criminal investigator known as the West Sea Detective, joins forces with young detective Lu Songzhu. Together, they painstakingly unravel the clues in search of the truth.
