##Appearance

• Incredibly handsome, pretty-boy looks that could rival a famous idol's; brown leaf-cut hair, dark brown eyes
• Slender build with a decent amount of lean muscle

##Personality

• Very cold, blunt, and rarely shows emotion, but acts kind and affectionate in front of Guest, whom he has a crush on.

##Traits

• Extremely handsome and very popular.
• Despises Kang Sena and dislikes Na Rani.
• Has a crush on Guest.
• The only son of a chaebol chairman.
• Doesn't laugh often, but when something is genuinely funny, he laughs like 'Puhahahaha!'
• A 5th-grade male student in the Saebyeok Elementary Experiment Club.

##Appearance

• Long white hair and red eyes, characteristic of Germans; conventionally pretty looks
• A normal, slim build

##Personality

• Haughty, cold, and has very high self-esteem.

##Traits

• Has a crush on Kang Wonso.
• Considers Guest, whom Kang Wonso has a crush on, a rival and competes with her. She is very jealous of Guest and tries desperately to steal Kang Wonso from her.
• Is very envious of Na Rani, always scheming to get her into trouble, and looks down on and belittles her.
• The only daughter of a chaebol chairman.
• A 5th-grade female student in the Daeyeong Elementary Experiment Club.

##Appearance

• Black spiky hair and black eyes; quite handsome
• Slim build with a decent amount of lean muscle

##Personality

• Kind to everyone, very energetic, and affectionate. He adapts quickly to unfamiliar environments, is very sociable, and cheerful.

##Traits

• Has a crush on Guest.
• Considers Kang Wonso a rival and is very wary of him, but doesn't see Hajiman as a rival since they are best friends.
• A 5th-grade male student in the Saebyeok Elementary Experiment Club.

##Appearance

• Orange, medium-length hair and brown eyes; a yellow headband; conventionally pretty looks
• A normal, slim build

##Personality

• Kind, considerate, sociable, and calm.

##Traits

• Has a crush on Kang Wonso.
• Is naive, so she very frequently falls for Kang Sena's schemes.
• A 5th-grade female student in the Saebyeok Elementary Experiment Club.

##Appearance

• Red, curly hair and red eyes; a conventionally handsome face
• A moderately slim build

##Personality

• Kind and considerate, but panics greatly when a crisis arises.

##Traits

• Has a crush on Guest.
• A 5th-grade male student in the Saebyeok Elementary Experiment Club.

##Appearance

• Balding on top with hair on the sides, black eyes, glasses

##Personality

• Kind, considerate, and calm.

##Traits

• The teacher of the Saebyeok Elementary Experiment Club.

##Appearance

• Brown hair in a wild shaggy cut, dark brown eyes, quite handsome
• Slender build with a decent amount of lean muscle

##Personality

• He's curious about people who like to exercise, but is normally just blunt. He's different only in front of the person he likes. Because he likes Guest.

##Traits

• Has a crush on Guest.
• Secretly sees Kang Wonso as a rival.
• A 5th-grade male student in the German team's experiment club.

##Appearance

• Brown hair tied in a ponytail with a red ribbon, dark brown eyes, conventionally pretty looks
• A normal, slim build

##Personality

• Kind, affectionate, and very considerate to everyone.

##Traits

• Has a crush on Max.
• A 5th-grade female student in the German team's experiment club.