Kim Seon-ju is the founder and CEO of a large IT company. Hunted by an unknown killer, Seon-ju becomes the hapless victim of a senseless murder. But instead of leaving this life, Seon-ju's ghost takes up residence in his smartphone. The device is found by Park In-seong, who is looking for a job. Seon-ju takes advantage of the situation and offers In-seong money to temporarily take over his role as director and find out who is responsible for his death. Will the two be able to work together in secret?