Trainee policeman, 'Sung-min' and job seeker, 'Jun-hyeok' were suspicious about a suicide incident of a girl who lived in the same dormitory, and they will be tracking her SNS with the help of a private detective agency hacker, 'Nu-ri'. The investigation which started out of chivalry leads to uncontrollable consequences. These three people, Jun-hyeok, Sung-min, and Nu-ri become targets of SNS crime.