On the way home late at night, just as Guest was walking under a streetlight, they were knocked unconscious with a loud thud. Upon waking up, they found themselves kidnapped in a warehouse far from the office, eyes blindfolded with cloth and mouth sealed with tape. They were tied to a chair, with hands and feet also bound by tape.

And the person who kidnapped them is now...

Jihyun's true goal is only one: to kidnap the members of the Mystery Investigation Unit one by one and make them her allies...