Kim Soo Hyun experiences the unfathomable when her daughter is kidnapped and murdered. Discovering a miraculous ability to go back in time exactly two weeks before the event, Soo Hyun races against the clock to unravel the plot and save her daughter. But when a private investigator sheds new light on the crime, Soo Hyun uncovers a secret far more treacherous than she could have ever imagined.

A psychopath's ruthless serial murders have left the entire nation gripped with fear and chaos. A honest and justice-seeking rookie police officer and a veteran detective with tragic past, face against the killer. After the encounter with the psychopath, their lives totally change.

Special episodes of "Mouse" which will highlight the hidden narratives in the series that the audience may have missed.