Daichi Kitajima has become a firefighter as a consequence of his childhood experience of being rescued by a fire rescue team. Despite his trauma, he strives to be promoted to become a member of the Special Rescue Team. Beginning with Daichi, this story follows him and his fellow rescue team trainees as they grow as rescue workers, as people, and as men. While facing the indiscretions of youth, and internal conflicts, they encounter the many imbalances between the ideals and reality in lifesaving along the way.

This series is different from the past detective stories. The Lieutenant is collection of true mystery stories in which the detective, Ninzaburo Furuhata, must solve ingenious crimes and outwit elusive criminals. Although Ninzaburo Furuhata is a government officer, he does not wear a tie. Although he specializes in murder cases, he does not carry a gun. He does not use violence. More than anything, Ninzaburo Furuhata conducts himself as a gentleman, and uncovers the tricks which outwitting genius criminals play by cool reasoning and smooth talking. In every episode, Ninzaburo Furuhata will introduce a different criminal in his memory, and share his experience tracking and interacting with these criminals.

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Rong Jinxiu (Chen Qiao’en) arrives in Shanghai in search of her half-sister, Yin Mingzhu (Lv Jiarong). Jinxiu’s family has fallen on hard times and is hoping for any sort of assistance from Mingzhu. However, Mingzhu, who is now the lover of a well-known businessman, still harbors hatred for the Rong family because they abandoned Mingzhu and her sickly mother many years before.

Mingzhu is willing to meet with Jinxiu once but does not offer any help. On her way out of Mingzhu’s luxurious house, Jinxiu literally bumps into Xiang Yingdong (Kimi Qiao), who has a crush on Mingzhu despite her being the woman of his older brother. With Yingdong is Zuo Zhen (Huang Xiaoming).

Unable to find food or lodging, Jinxiu wastes away on the streets of Shanghai and is discovered by Zuo Zhen and one of his followers, Shi Hao (Yang Le). They bring her to a high-end hotel owned by Yingdong. Thinking that she was rescued by Yingdong, Jinxiu develops a crush on him, which she confesses to Zuo Zhen.

The series starts with the murder of a 10-year-old girl in 1984. 15 years later, after the case goes unsolved and passes the statute of limitations, a doctor named Goda Ryoji suddenly quits from his hospital and eventually becomes a detective. In 2008, he meets Sachi, a traveling artist in Paris, and shortly after Goda's return to Japan, he becomes involved in the expired murder case when another detective receives an anonymous phone call.

A major newspaper has informally decided to employ a female university student. However, shock ripples within the newspaper because of a weekly magazine’s scoop that she is the daughter of the criminal in a serious case. This was the kidnapping of a newborn baby at a big hospital 20 years ago. The criminal demanded a ransom from the director of the hospital instead of the parents. But after the criminal had the large sum of money in hand, he died in an accident while being pursued by the police. The baby was never found. Kaji Hidekazu, a former hotshot journalist who has become deadwood in the wake of an incident, is ordered by the newspaper to re-investigate the kidnapping case. He finds out the shocking, tragic truth which had been kept under wraps.