Kang Dong-joon is a young car designer who desires to start his own car company in Korea. He tries to get assistance from his father, but the family is troubled. His younger brother hates their father, and leaves the country to become a car racer in the United States. Meanwhile, his sister also flees to the U.S. after conceiving a child with a U.S. army soldier.

In 1919, Luan Xuetang was a little beggar that nobody cared. After fleed in Beijing, he entered Jifenglou Restaurant and became a waiter by chance. Later, he was expelled because of knowing the boss's scandals by accident. Maybe Luan Xuetang's destiny should not be over, he met the honored man in his life when he had no other way out, with the help he founded Fengzeyuan Restaurant and opened a new era in which he controlled his own destiny.

The show is reported to follow Moon Seok Goo, Oh In Bae, and Pielleggu as they band together to steal trade secrets from DM Group’s competitor.

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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