In a bustling city, delivery boy Liu Jiang lives an ordinary life, but unexpectedly gets involved in an underground fighting match. Because of his status as a thin delivery boy, he was despised by everyone and thought that he would soon fail miserably. But Liu Jiang awakened the power of "the harder he was beaten, the stronger his rebound" and launched a counterattack. He easily defeated his opponent in the ring and attracted the attention of the black market boss. The boss regarded him as a thorn in his side and sent people to deal with him with guns, but Liu Jiang took the bullet in his face and wounded the enemy. However, despite his victory, he was chased by his boss and fell into crisis. At the same time, as a delivery boy, he has difficulty gaining a foothold in the fighting world due to his status restrictions. Whether Liu Jiang can break through his class, survive in this hostile environment, escape the pursuit of his boss, and become an urban legend is still unknown.
