What is the significance of your life? After receiving the SNS message, death has begun! Trainee policeman, Sung-min (Lee Si-eon) and job seeker, Jun-hyeok (Kim Sung-cheol) were suspicious about a suicide incident of a girl who lived in the same dormitory, and they will be tracking her SNS account with the help of a private detective agency hacker, Nu-ri (Heo Gayoon). The investigation which started out of chivalry leads to uncontrollable consequences. These three people, Jun-hyeok, Sung-min, and Nu-ri became targets of SNS crime...