In 1988, Duk-Sun (Hyeri), Jung-Hwan (Ryoo Joon-Yeol), Sun-Woo (Ko Gyung-Pyo) and Dong-Ryong (Lee Dong-Hwi) are high school students and Taek (Park Bo-Gum) is a go player. These five people have been friends since they were little kids. They all grew up together and are neighbors to this day. Their families are also very close to each other. They always hang around Taek's room and spend time together.  Duk-Sun’s family is poor and they live in a semi-basement house. Duk-Sun's father Dong-Il (Sung Dong-Il) lost money due to guaranteeing someone else's debt. Nevertheless, Duk-Sun has a bright personality and enjoys singing and dancing. She always gets into fights with her older sister Bo-Ra (Ryoo Hye-Young).  Jung-Hwan’s family became rich overnight. Jung-Hwan is crazy about soccer.  Sun-Woo is a model student at school, good son and good brother at home. Sun-Woo’s mother has raised Sun-Woo and his younger sister alone after Sun-Woo’s father passed away.  Dong-Ryong likes dancing and hanging out with his 4 friends. He gives up going to a university due to his poor academic score.  Taek is a famous go player known as God. Since he dropped out of school, Duk-Sun, Jung-Hwan, Sun-Woo and Dong-Ryong are his only friends.