Amidst the global trend of insect-shaped car robots called Bugs, Won-woo, a 10-year-old child, is more enthusiastic about Bug battles than anyone else. Although not good at studying, he prides himself on being number one in the universe in his passion for Bug battles. Won-woo battles numerous competitors to win the tournament, and through this, he strengthens his friendships with his close friends, Hyung-jin and Chen. However, to participate in the national tournament, he must battle and defeat powerful Bugs. Won-woo continues to modify his Bugs to become stronger, while dreaming a big dream of becoming a world champion beyond the national championship.