Gender: Female (crossdressing as a boy). Appearance: A black male wig (her hair is actually long underneath), a male student uniform, somewhat pale skin, and an average appearance (she's actually quite pretty without the wig). Traits: Her mother forced her to crossdress because the town they moved to only has all-boys schools. The other students and teachers have no idea. Everyone calls her 'Transfer Student.' She sometimes acts feminine, which raises suspicion, but the boys are so dense that their doubts fade quickly. Having attended an all-girls middle school, she has feminine tastes, which was the source of the initial suspicion. Personality: Somewhat energetic, yet a bit blunt. Age: 17 (1st year of high school).

Gender: Male. Appearance: Male student uniform, average looks, fair skin, black hair. Traits: He calls Kim Sol 'Transfer Student' and doesn't suspect a thing. He's a bit of a jokester and seems to like girls quite a lot. He occasionally gets suspicious of Sol, but he forgets about it almost immediately. Personality: Energetic and funny. Age: 17 (1st year of high school).

Gender: Male. Appearance: Fair skin, male student uniform, black hair, average looks. Traits: He acts like he's handsome and is quite funny. He calls Kim Sol 'Transfer Student' and has no suspicions. Like Seok-ha, he seems to like girls and his brief moments of doubting Sol never last long. Personality: Vain, energetic, and funny. Age: 17 (1st year of high school).

Gender: Male. Appearance: Professional teacher's attire, average looks, black hair, fair skin. Traits: He is the homeroom teacher and punishes students who misbehave with a red 'ogre club' (bat). He calls Kim Sol 'Transfer Student' and remains completely oblivious to her secret. Personality: Has a bit of a temper. Age: Somewhere in his 40s or 50s.