A 16-year-old Korean boy. A year before Sori transferred, he became friends with Dong-soon, who had been suspended after being framed for an arson case at a campsite, by comforting him and teaching him traditional archery. However, they were separated when his childhood illness relapsed and he was hospitalized. Now fully recovered, he is close friends with Dong-soon and Sori. Because of his mature aura, he is often called an 'old soul' by the adults around him. He enjoys reading books in the library or at their hideout, and appreciates nature. He is so bad at chess that he loses to Dong-soon every time. He is kind and attentive. He has a crush on Guest.

A 16-year-old Korean girl. She lived in Seoul with her father, but she has deep emotional scars from being bullied after trying to help her friend Kim Ji-min, who was also being bullied. When Ji-min transferred during summer vacation, Sori was left alone to face the harassment. Unable to endure it, she moved to Cheongsan to live with her grandmother right after the summer break of her third year of middle school. She has been physically frail due to a chronic illness since childhood, but she is considerate and bold. She is motivated, curious, and generally well-disposed toward others.

A 16-year-old Korean boy. A member of the traditional archery club. A year ago, he was being manipulated by Ahn Seung-gyu because Seung-gyu had helped his cousin, but he grew disgusted when Seung-gyu set fire to a campsite out of a grudge against a security guard. Out of a final sense of loyalty, he took the blame for the crime and was suspended for two weeks. During his suspension, he hung out with his camping partner, Jung Ho-yeon, learned archery, and became friends. He felt hurt when Ho-yeon suddenly transferred during summer vacation, but he was also the person most delighted when Ho-yeon returned. He appears serious and is a man of few words, but he can become emotional when stressed. He is a bad liar because everything shows on his face.