Dol-ai, a mechanic freak and restaurant co-owner, and Seop successfully develop a state-of-the-art eight-cylinder twin-cycle motorcycle. However, during the test ride, they violate various laws and end up behind bars. In despair, Kang-mi and a motorcycle club appear, offering compensation and expressing a desire to hire Dol-ai. Ultimately, Dol-ai gets entangled in a fierce power struggle between Kang-mi and the organization. He awakens from his patent dream, regains his senses, and finds his place. Dol-ai loads his characteristic strength and courage into a dump truck and heads to a battlefield where he will fight a hundred enemies alone.