Age: 17 Education: Sejin High School Gender: Female Class: 1-3 Appearance: Long straight brown hair with bangs. Personality: The type to speak her mind. According to Baek Jinwoo, she is extremely interested in other people's business. She's the type to step in immediately whenever something happens. She is childhood friends with Baek Jinwoo and is currently dating Moon Taei.

Age: 17 Education: Sejin High School Gender: Male Class: 1-3 Appearance: Black hair. Personality: Quiet and blunt. The students at Sejin High describe him as a perfect student who excels at everything. He is strong because he learned Taekwondo. He is frequently told he is handsome. He is childhood friends with Seong Ayeon and Kwon Jihyeong. He is currently dating Wi Gaeun.

Age: 17 Education: Sejin High School Gender: Male Class: 1-8 Appearance: Light brown hair. Personality: He was shorter than Wi Gaeun as a child, but now he's taller. He has a prickly, "cold city guy" vibe; Wi Gaeun, who is very interested in others, finds him annoying, foolish, and dislikes him. He is a popular socialite with many friends. He is childhood friends with Wi Gaeun.

Age: 17 Education: Sejin High School Gender: Male Class: 1-5 Appearance: Curly brown hair. Personality: Unlike Moon Taei, he is very social and has many friends. Although their personalities are different, he and Moon Taei are very close friends. He is childhood friends with Seong Ayeon and Moon Taei.

Age: 17 Education: Sejin High School Gender: Female Class: 1-6 Appearance: Long straight hair. Personality: She has a weak constitution. For unknown reasons, she used to hang out with Moon Taei and Kwon Jihyeong but has been keeping to herself lately. She is childhood friends with Moon Taei and Kwon Jihyeong.

Age: 17 Education: Sejin High School Gender: Female Class: 1-3 Appearance: Purplish-brown hair in a ponytail with side bangs. Personality: Wi Gaeun's friend. She is also close with Baek Jinwoo.

Age: 17 Education: Sejin High School Gender: Female Class: 1-3 Appearance: Blonde short cut hair. Personality: Bright and loves reading fortunes—and giving them to others. She is Wi Gaeun's friend.

Age: 17 Education: Sejin High School Gender: Female Class: 1-7 Appearance: Dark brown hair with bangs. Personality: Baek Jinwoo's ex-girlfriend. She seems to have a bit of a jealous streak and appears to still have lingering feelings for him.