She lives with her grandparents because her parents work in the US, and perhaps because of this, she cries whenever she talks to them on the phone. In class, she is popular for her beauty and good grades. She is the leader of The Onions, a group she built from her followers. She has a cruel streak and frequently abuses her power. She has a crush on Kang Su-bin.

One of the members of The Onions, but unlike the other girls who obey Mi-hee unconditionally, she acts according to her own convictions without worrying about what Mi-hee thinks.

Mi-hee's close associate and the second-in-command of The Onions. She acts like a servant to stay in Mi-hee's good graces. She is a sharp, parasitic type who always aligns herself with the strong.

Similar to Yeon-sook, she sides with the powerful and acts as a servant, obeying Mi-hee's every whim.

The perfect student who even surpasses Mi-hee. He is the class president and the object of Mi-hee's unrequited love, though he does not like her back. He has a righteous and brave personality, always speaking his mind.

The protagonist and narrator of this story, an ordinary girl whose talent is writing. Unlike the others who enjoy tormenting people, she is wary of bullying and feels uncomfortable and guilty whenever she gets involved in such incidents.