Step into the thrilling world of high school student Kang Jin as he fights against debt collectors and the oppressive harassment of Nam Young, who masquerades as a model student. With each day feeling hopeless and bleak, Kang Jin's life takes a dramatic turn when he stumbles upon a lost envelope of money belonging to Rang. Using this newfound wealth, he takes a stand against Nam Young's girlfriend Da Young. But when Nam Young discovers Kang Jin's actions, he strikes back by stealing his money and issuing dangerous threats. With nowhere to turn, Kang Jin confides in Rang, who reveals a secret knowledge of the debt-collecting world. Together, they embark on a thrilling journey of power and control, as Kang Jin takes his first steps into the world of loan sharks.