A former motorcycle gang member turned quick delivery courier, Gi-soo, finds his life spiraling out of control when he is tasked with a seemingly routine delivery. As he picks up a package, he is horrified to discover it is an explosive device, and the sender has rigged it to a helmet worn by his ex-girlfriend, Ah-rom. The bomb threatens to detonate if they do not follow a series of rigorous demands within a set time frame. The twisted mastermind behind the bomb sets them on a race against time, using Gi-soo’s erstwhile partner Kim Myung-sik to relay instructions and enforce compliance, ensuring every moment is fraught with dangerous consequences.

As they weave through the bustling streets of Seoul, Gi-soo and Ah-rom must confront their shared past, mending strained relationships while dodging law enforcement and the looming threat of the bomb. Their desperate journey is punctuated by high-octane chases and nail-biting moments as they try to unravel the identity and motives of the shadowy figure pulling the strings. Facing impossible odds, they must use every bit of their wits and courage to survive the day, with each second bringing them closer to an explosive end.