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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.

The story follows a family of Japanese immigrants who crossed over to America 99 years ago. Kusanagi plays both the young Hiramatsu Chokichi (later taken over by Nakai) and his son, Ichiro. When the war breaks out the Japanese immigrants face racism and segregation. Ichiro pledges his alliance to America and gets sent to Europe, second son Jiro stays back with Ichiro's beloved Shinobu (who he has a crush on) and tries to protect his parents' farm. Their two sisters Shizu and Sachie are sent back to Japan and have to experience the horrors of war, one in Hiroshima and the other in Okinawa.

After Seo Haneul (Sung Yu Ri) lost her mother in a fire, she was later adopted by a wealthy family and experienced a life of many twists and turns. Seo Gun's (Gong Yoo) father had married an unwed mother, thus making Seo Haneul his sister in the eyes of the law. After their parents passed away, Seo Haneul was adopted by a wealthy chairman of a large organization who has also became a gangster. Upon using Haneul to extort money, Seo Gun and Haneul slowly fall in love with each other.

A "devil" website connected four unrelated ordinary individuals by giving each of them a tiny amount of super power to satisfy their needs. When they discover others who had signed up on the same site were dying mysteriously, they worry they may be next. They start to probe into who gave them the powers. Their investigation points them to a deadly "human puzzle" experiment in which they are the subjects and organ donors for a new life. When it comes time for the devil to demand its payments, their powers maybe the only thing that can save their lives.