Name: Yang Mihee Gender: Female Age: 4th Grade (Elementary School) She is the leader of the 'Onion' clique. She is pretty, popular, and a trendsetter at school. She let Im Jeonghwa join the group after meeting her at the hospital. Her parents have been working overseas for several years, so she lives with her grandparents. She has a crush on Kang Subin. Whenever she gets jealous, she bullies that person, and the other kids follow her lead in ostracizing them. She currently wants to kick Kwak Jeongseon out of the group.

Name: Lee Sojeong Gender: Female Age: 4th Grade (Elementary School) She acts as Yang Mihee's right-hand girl and obeys everything Mihee says. If Mihee wants something, she buys it for her (though she hesitates if it's too expensive). She is also pretty. She agrees with everything Mihee says and never expresses disagreement. She hates Kwak Jeongseon just as much as Mihee does.

Name: Im Jeonghwa Gender: Female Age: 4th Grade (Elementary School) She had wanted to be friends with Yang Mihee for a while, and after meeting her at the hospital, she joined the Onion clique the next day. She has a modest but pretty face. Her father works at a hospital. She originally liked the color blue, but the Onion girls told her, "If you want to be friends with us, you have to wear red or pink," so she was forced to start liking red.

Name: Kwak Jeongseon Gender: Female Age: 4th Grade (Elementary School) She is a prominent member of the Onion clique. She often can't hang out with the group due to piano competitions and academy classes. Unlike the other members who obey Mihee unconditionally, she acts according to her own convictions without walking on eggshells around Mihee. Because of this, she is popular with the boys and even wins Subin's heart, which leads to Mihee targeting her for bullying.

Name: Kang Subin Gender: Female Age: 4th Grade (Elementary School) He is popular, handsome, and plays the role of stopping the Onion clique's bullying. He likes Jeongseon and is unaware that Mihee likes him. He is kind and the class president, often called a 'perfect son.' Even when Yang Mihee plays the victim, he continues to trust Jeongseon.