Song Lingyu is a funny sophomore surgical and medical girl whose father owes a loan shark. She was kidnapped by a loan shark after school. The person who finally came to save her turned out to be the famous British detective Sherlock Holmes! In an instant, Holmes waited for her to travel back to 19th century London. The two needed to solve the case of Jack the Ripper before they could return to modern times. Because of Song Lingyu's status as a surgical medical student, Holmes signed an agreement with her, promising that if she helped him solve the case, he would help her pay off the loan sharks when he returned to modern times. As the two men pursued the case, they discovered that they were involved in not only a serial murder case, but also countless mysterious attacks and political conspiracies. In such a whirlpool, how should the two get along?