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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.

The little siblings Ji-ho and Seon-ho live on their own without a protector. They lost their mother to a hit-and-run accident and their father has been wandering all around the nation trying to catch the culprit. But they valiantly live everyday loving each other. One day, they receive a phone call from the police station, which makes them misunderstand without a second thought.