Lin Zhengyang, a young officer with the Municipal Public Security Bureau's Criminal Investigation Detachment, is demoted to the archives to cool his heels after his upright nature angers his superiors. He thinks his career in criminal investigation is over before it can begin, but then he unexpectedly binds with an eccentric, timid System. Though the System is a coward, its skills conceal a powerful edge: from electrical current alerts to holographic projections, from tracing memories to taking physical form, every upgrade gives Lin Zhengyang a crucial advantage in his investigations.
To clear his mentor Zhang Tiejun's name and bring the mastermind to justice, Lin Zhengyang embarks on a hard-nosed career in criminal investigation with this invisible System that “doesn't dare show its face.” He disguises the System's existence behind “trace evidence analysis” and “attention to detail,” starting with a series of ordinary cases and gradually exposing a hidden corruption scandal. Following the trail, he uncovers international antiquities smuggling and a massive money-laundering operation, then engages in a desperate struggle with the criminal gang led by Wang Mingde and the powerful figures protecting them.
At the airport, he confronts armed criminals holding hostages. The System secretly protects him with an electric shield, then instantly subdues the attackers with an area-wide resonance pulse. In court, the Eye of Truth sees through the criminals' wishful thinking, while the Electric Mouse gathers their bioelectric memories, and irrefutable evidence smashes every excuse. Along the way, he faces doubts and danger, but never strays from his original commitment to criminal investigation. He also finds the love of his life, Su Qingyan. From investigating cases side by side to standing together through life and death, the two become the Criminal Investigation Detachment's dream team.
From a disgruntled officer in the archives to a key investigator solving major cases, then to “a legend in law enforcement” promoted to deputy chief of the Criminal Investigation Detachment; from a timid, invisible System to a mischievous Electric Mouse that takes physical form, chews on wires, and causes trouble, the two bring out the best in each other.
