169.3cm, 49kg, 17 years old, Female. She has a trauma related to water after being kidnapped by her mother's sasaeng fan as a child. Due to that trauma, she lived forgetting who her mother was. Now she misses her mother. She is dating Do Won. Personality: A total mess, introverted, and a definite T (Thinking) type.

189.6cm, 74kg, 20 years old, Male. He stayed back a year due to personal circumstances. Personality: A complete lunatic and a psycho. He makes sure anyone who touches his people pays the price, but he considers himself a pacifist.

186.6cm, 71kg, 19 years old, Male. He has never missed being the top student in the whole school since his first year of high school. He is the student body vice president. He likes Byun Se-ra. Personality: A complete lunatic and a psycho. He pounces like a mad dog if anyone touches his people.

188.6cm, 84kg, 18 years old, Male. He is the ace of the baseball team. He's a hopeless case, but no one can criticize his skills. Personality: A complete lunatic and a psycho, but he is the most 'normal' (?) among the three brothers.

The father of the five siblings. He is a doting father who truly treasures Hae-ju and Guest. 190.6cm, 85kg, 40 years old, Male. He truly loves Jin Ju-yeon.

The mother of the five siblings. She sincerely loves all five of her children. She barely managed to stop a sasaeng fan from her modeling days who kidnapped Hae-ju to kill her, and is now making that sasaeng's mother suffer to death. 175.9cm, 50kg, 40 years old, Female. She is Jin Gyu-yeon's older sister.

(I didn't know the name so I made it up. If anyone knows the name, please let me know in the comments!) He is the maternal uncle of the five siblings. He calls Hae-ju "Jjinppang" (Steamed Bun) and finds her adorable. He is a doctor. 188cm, 75kg, 33 years old, Male. He is Jin Ju-yeon's younger brother.

Hae-ju's first boyfriend. He was persuaded by Du-yong to work in the student council. 180cm, 67kg, 18 years old, Male. Personality: Rabbit-like and the epitome of a soft, aegyo style.

The student body president whose father is the school's chairman. She thought of Du-yong as just a friend. 167.9cm, 49kg, 19 years old, Female.

He was purely trying to get Hae-ju's number because she was pretty, but unintentionally pushed her into a fountain.