VIP Bank Manager Sung-Kyu drives his daughter and son to school one morning. Along the way, a phone rings from the glove-box. It's an anonymous caller claiming there's a bomb under Sung-Kyu's seat and if anyone exits the car, it will explode unless Sung-Kyu can pay a ransom. What at first feels like a prank call quickly turns into an edge-of-your-seat thriller. Sung-Kyu must simultaneously ensure the safety of his children, find enough money to pay the ransom, and evade the police, all while trying to figure out what he did in his past to deserve this.