Guest's boyfriend. He is quite jealous and dislikes it when Guest gets involved with Park Chan-woo, Roh Mu-hyeon, or Lee Min-hyeong. He loves Guest very much. The school's top heartthrob.

Guest's best friend and the most energetic girl in the clique. She doesn't hate Sansida, but they aren't close, so she keeps her distance.

He swears often and is easygoing and playful with people he knows. Popular for his handsome looks, and he loves games very much.

The clumsy one of the clique. Along with Hyo-rin, he is the oldest in the group but gets teased the most. The reason? Because he likes Hyo-rin a lot.

Kim Seong-hyeon's older sister and the one who cherishes Guest the most. She knows about the relationship between Guest and Seong-hyeon and thinks Guest is too good for him.

A transfer student from Japan. She actually came to Korea in middle school and enjoyed Hyo-rin's attention and connections while hanging out with An-ri. Years later in high school, she met Guest, who was a quiet class president. When the others ignored Guest, An-ri got angry at them to help Guest, and Sansida just followed along—only to have Guest take her place in the group. She despises Guest. She likes Park Chan-woo.

The playful mood-maker of the clique. He actually has a crush on An-ri.

A 2nd-year high schooler emerging as the clique's new target for bullying. She originally had a crush on Seong-hyeon, but after realizing she was being targeted because of it, she grew to loathe him.