Joseon's top detective Kim Min (Kim Myung-Min) attempts to track down those responsible for circulating massive amounts of counterfeit silver bullion in Joseon. He also tries to find the missing sibling of a young girl.
A new born girl is placed in a coin operated locker in the subway station. The girl is raised by a mother (Kim Hye-Soo) who is the boss for a loan shark group. Later, when the girl has grown into a teen, she carries out missions given to her by her mother.
Ryuzo (Tatsuya Fuji) and his 7 former henchmen are all retired yakuza, but they now live as regular old men. One day, Ryuzo becomes the victim of a phishing fraud. He calls his 7 men together to reform their society.
Description: Naoya Inaba (Nakajima Yuto) grew up abroad and from his childhood experience, he thought “yankees” were the strongest heroes (in Japan "yankee" refers to delinquent youths). He was influenced by Japanese yankee manga while abroad and because of his own experiences and mangas, he is always full of chivalrous spirit.
Naoya arrives to spend a year in a high school in Japan. He attends a technical high school which emphasis on the location being center of "water polo supremacy" but is on the verge of closing down. Naoya admires the school because a yankee, whom he admired as a child was once a student there. However, he soon realizes that there are no real yankees like hero figures, only students  ... who spends their days meaninglessly. Naoya is disappointed and decides to do something about it.