Junho and Wooyoung are twin and they are just 8 years old. They have a brother who is younger than them by approximately two years, named Yoseob. Yoseob is a cute and bubbly boy. But to the twins, Yoseob is the most annoying creature ever. Thing gets started when their parent is going out for an occasion. They are told to babysit their youngest brother for three hours and the three hours has changed their view of their little brother. What had happened actually? Let's check it out.