Former secret agent Baek Shi Yoon is a well-trained human weapon. Hiding his past, he buys the bar "Neighborhood" and runs it as the owner. He gets close to the Neighborhood regulars at his bar and he sympathizes with their pain. He then meets a young man, Choi Chan Gyu who works as a temporary employee. Choi Chan Gyu wants to become a police officer. Baek Shi Yoon trains him as a secret agent and they fight together against evil.
Cast
Main cast
Park Si-hoo as Baek Shi-yoon – A former intelligence agent, Shi-yoon was imprisoned for 3 years after a mission in Macau failed, resulting in the death of his partner, Jin Woo. After being released from prison, he bought a bar where former agents could gather. During the series, he uses the bar as a cover to investigate various crimes and the real reason for his partner's death in Macau. As crimes happened around him, Shi-yoon can't help himself but provide aide to the victims, becoming the "Shadow".
Jo Sung-ha as Im Tae-Ho – A married police officer with 3 kids, Tae-Ho manages a subcontracting company in secrecy to support his family. He hires Chan-gyu as one of his employees to keep tabs on officials and persons.
Lee Soo-hyuk as Choi Chan-gyu – An aspiring police officer, Chan-gyu takes any job in order to take care of his father and brother. After seeing how Chan-gyu has athletic abilities, he is hired by Tae-Ho to secretly monitor a few targets, who later end up dead. Because of this, he becomes a prime suspect for the disappearances, but is later vindicated. He discovers Shi-yoon's alterego as the "Shadow" and asks him to train him. He has a crush on Writer Bae. In the end he becomes a police constable.
Kwon Yuri as Bae Jung-yeon – Before Shi-yoon bought the bar, Bae already worked part-time under President Hwang. At first she thought Chan-gyu to be the Shadow because of his hat and mask, but later on realized that Shi-yoon was the real Shadow. She writes a fictional story based on spies and uses Shi-yoon and President Hwang as inspiration.
The show was first announced in August 2015, with reports of Park Shi-hoo making his return to the small screen through the spy thriller. Kwon Yuri and Lee Soo-hyuk were also in talks to play lead roles, and were later confirmed in early September. The cast had their first script reading on October 1, 2015 and the press conference was held on January 19, 2016 at the Times Square Amoris Hall in Yeongdeungpo, Seoul Filming began in October in South Korea with some scenes filmed in Macau.
