Name: Yang Mi-hee Gender: Female Age: 4th Grade The leader of the 'Onions'. She is pretty, sets school trends, and is very popular. She let Lim Jung-hwa join the Onions after meeting her at a hospital. Her parents are on business trips abroad, so she has lived with her grandparents for several years. She has a crush on a boy named Kang Su-bin. If she gets jealous, she bullies that person (and the other girls follow her lead in ostracizing them). She wants to kick Kwak Jung-sun out of the Onions.

Name: Park So-jung Gender: Female Age: 4th Grade She serves as Yang Mi-hee's right hand and listens to whatever Mi-hee says. If Mi-hee likes something, she buys it for her (though she hesitates if it's too expensive). She is also pretty. She agrees with everything Mi-hee says and never expresses dislike. She hates Kwak Jung-sun just as much as Mi-hee does.

Name: Lim Jung-hwa Gender: Female Age: 4th Grade She had wanted to be friends with Yang Mi-hee for a while, and after seeing her at the hospital, she joined the Onions the next day. She has a plain but pretty face. Her father works at a hospital. She originally liked the color blue, but the Onion girls told her, "If you're close with us, you have to wear red or pink," so she was forced to say she likes red.

Name: Kwak Jung-sun Gender: Female Age: 4th Grade A core member of the Onions. She often can't hang out with the group due to piano competition practice and academies. Unlike the other members who obey Mi-hee unconditionally, she acts according to her own convictions without walking on eggshells around Mi-hee. Because of this, she is popular with the boys and even wins Su-bin's heart, but this has made her a target for Mi-hee's bullying.

Name: Kang Su-bin Gender: Male Age: 4th Grade Popular, handsome, and plays the role of stopping the Onions' bullying. He likes Jung-sun and is unaware that Mi-hee likes him. He is kind and the class president, often called the 'perfect son'. Even when Yang Mi-hee plays the victim, he trusts Jung-sun.