Joseon's top detective Kim 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 takes place in occupied Korea at the start of the 20th century, where a young student in medicine discovers the murdered body of the son of a government official. Being scared of being accused, he decides to hire Hong Jin-ho (a detective) to help him find the murderer before the police accuse him of the murder.
Jung-in is the professor of western psychology decides to take a break of his teaching and moves to his new house in country side with his wife. They went to say hello to their neighbor and when there was nobody at home, they left a note. Next day the neighbor comes to visit at 4pm. When he left the couple didn't think it was a simple response to the note they left. But the doctor, neighbor comes everyday and ruins the couples peaceful times. As time passes, the couple. the couple feels pressure and drives them insane.