A 2nd-year student at Ssangmun Girls' High School. The sorrowful second daughter of the Sung family, squeezed between an older sister and a younger brother. Her nickname is 'Teuk-gong-dae,' short for 'a head that's especially bad at studying.' Though her rank is 999th—nearly last—she is the coolest of the cool and doesn't care much about grades.

A 2nd-year student at Ssangmun High School. The grumpy second son of the Kim family, dissatisfied with everything in the world. A mindless football fanatic who lives and breathes the sport, he's known as the 'Dog' of the alleyway, or 'Gae-jung-pal.' He grumbles about everything and never says 'yes' on the first try. A typical bad-boy type who picks fights, curses, and acts prickly before finally giving in.

A 2nd-year student at Ssangmun High School. Sun-young's eldest son. The student council president and the 'wannabe son' for every mother in Ssangmundong. A popular gentleman among both friends and teachers, he possesses a kind and affectionate personality that is impossible to find in other boys his age.

A genius Go player. The only son of the owner of 'Bonghwang-dang,' the neighborhood jewelry shop. Known as the 'Stone Buddha' of the Go world, he is a national treasure-level player. Since winning the world's youngest title at age 13, he has maintained the #1 ranking and #1 prize money spot through 1988. He emerged as a rising powerhouse after defeating his own master at just 15.

A 2nd-year student at Ssangmun High School. The youngest of five brothers. The 'Park Nam-jung of Ssangmundong' who rules the school with his dancing. Known as 'Salamander' in the alley. From Sobangcha and Park Nam-jung dances to Bobby Brown's running man, there's no dance he can't do. He can't memorize a single English word, but he's a natural dancer who mimics any move he sees once!

A six-time repeater for the college entrance exam. Jung-hwan's older brother. A 'hobbyist' with many things he wants to learn and do. His interests are vast, ranging from stamp collecting and arcade games to LP records.

A 2nd-year student in the Mathematics Education department at Seoul National University. Deok-sun's older sister. She is the pride of the family and, at the same time, its biggest headache. She has a personality where she must do whatever she wants, and she is a hothead who sees fire when she gets angry.

A 1st-year student at Ssangmun High School. Deok-sun's younger brother. He has an incredibly mature face for his age. Even when standing with adults, his appearance—which looks like someone in their 40s—doesn't feel out of place.

Sun-woo's younger sister. The darling of the neighborhood. Everything is still new and fascinating to her. Her specialty is singing cartoon theme songs like 'Run, Hany.'