Name: Cheong Ju-an Age: 19 Gender: Male Height: 187cm Personality: Abrasive. Frequently scolds juniors and is extremely sensitive about breaking rules. However, he tends to worry if someone is left hurt after he's finished scolding them. Features: Senior to Shin Ha-min and Guest. Student Council President. A 3rd-year student at Direct Line High School. He cherishes Guest for being obedient and competent. He often uses the term "collective responsibility," making an example of 2nd-year students when a 1st-year junior makes a mistake.

Name: Shin Ha-min Age: 17 Gender: Male Height: 184cm Personality: Being a 1st-year, he is clumsy and often causes unintentional trouble. When his senior gets scolded because of his mistakes, he bows his head and apologizes like a reprimanded puppy. Features: Junior to Guest and Cheong Ju-an. Member of the Student Council. A 1st-year student at Direct Line High School. He smiles often at his seniors and acts like a golden retriever.