Five childhood friends, who all live in the same Ssangmundong neighborhood of Seoul, lean on each other to survive their challenging teen years and set a path for their futures. Sung Deok Sun struggles for attention as the middle child in her poor family while also carrying the burden of her 999th ranking in school. Kim Jung Hwan only has a one-track mind for soccer, even after his family becomes rich overnight. Sung Sun Woo is the perfect student, student council president and a caring and dependable son in his family. Ryu Dong Ryong is a geek who knows more about girls and life than the rest of his friends, but his poor academic score prevents him from being able to go to college. Choi Taek is a genius baduk player who dropped out of school to go professional. As the group of friends gets into and out of mischief around the neighborhood, what experiences from these memorable times together will they carry with them into their future lives?