Lee Yoon Ho, a motorcycle maniac who engages in many fights at school and known for his high kick, and Lee Min Ho, who enjoys spending time on scale models and web blogs, are brothers born a year apart but attending the same class at school. These two portray completely opposite Korean teenage characters in a comical way. Their family consists of; father, a full-time stock investor who is optimistic and reckless; mother, an oriental medicine doctor and always overly confident; grandfather, who loves money more than anything in the world; grandmother, who is always defeated by her daughter-in-law in quarrels; and uncle, a single dad who enjoys his life with his half-single and half-married status. This drama is a situation comedy, which portrays the everyday lives of the main characters colliding with each other in a comical way. However, at a certain point, the surprising mysteries of their seemingly-normal surrounding characters begin to unravel one by one.