In the bleak border area between North Korea, China, and Russia, known as Yanbian, Gu-nam, a down-and-out cab driver, grapples with crushing debt and the absence of his wife, who went to Korea in search of work and has not contacted him in months. Bearing the weight of despair and financial ruin, he is approached by a local crime boss, Myun-ga, with a dangerous proposal. Gu-nam is offered a large sum of money to cross the Yellow Sea and assassinate a businessman in South Korea. With little to lose and the tantalizing promise of enough money to clear his debts and search for his missing wife, Gu-nam accepts the perilous job, plunging into a world of violence and uncertainty.

Upon arriving in South Korea, Gu-nam's mission spirals out of control, leading to unexpected complications and drawing the attention of both the police and rival criminal elements. As he navigates the chaotic underbelly of his unfamiliar surroundings, the lines between his quest for redemption, his struggle to survive, and the dark web of criminal intrigue become increasingly blurred. The pursuit becomes a frantic, edge-of-the-seat chase, with Gu-nam desperate to stay one step ahead of the deadly forces closing in around him, all the while haunted by the mystery of his wife's fate.