Moon Ha-won is an AI programmer and he is the founder of AH Company. He is a consistent person with a good heart. Meanwhile, Han Seo-woo works as a classical music recording engineer. Her life is unstable without a family or house, but she is a positive person.

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

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.

It depicts the past of a prominent female forensic investigator suffering from antisocial personality disorder and the process in which the shadow of the father she killed threatens her honor and life.

A popular YouTuber who is kidnapped by an unidentified person and must live stream for an hour from the trunk of a moving car to earn 650 million won.

Determined to escape a dead-end life, a gifted high school student turns to a world of serious crime to ensure he can pay for college.