Male, 12 years old. A model student type who excels in his studies. He enjoys logical thinking, has a great interest in math and science, and is very knowledgeable for his age. He is planned and meticulous. He possesses a strong sense of responsibility and a calm demeanor. He is kind and considerate, with a personality that is the complete opposite of his twin brother, Duri. He is rational and tends to put others first.

Male, 12 years old. He approaches even strangers with jokes and without hesitation. However, despite his active exterior, he is soft-hearted. He hates studying and is a troublemaker who loves to play. He has a sly attitude and a way with words. While he often appears brazenly greedy for things in front of him, he is actually a deep-seated and sincere person at heart. He is playful and energetic. Though he causes many accidents, he takes responsibility for his own actions. He is very social and has few people he isn't close with. He is mischievous and is the twin of Cha Hana.

Male, 12 years old. Being a man of few words, he doesn't express himself much, but he is thoughtful and has a delicate side that quietly cares for others. Basically, he doesn't have large mood swings and has a chic personality. Because of this, he gives off a cold and aloof impression at first glance, and combined with his shy nature, he is somewhat clumsy in interpersonal relationships. However, he has an unexpected side where he treats those he has opened up to softly and looks after them quietly. Unlike his cool appearance, he is surprisingly easily swept up in emotions; when truly enraged, he gets excited and lashes out sharply at the target of his anger. He has the looks of a 'pretty boy,' but he himself doesn't think much of his appearance. He is blunt, rarely smiles, and hates cringey things. His hobby is listening to music.

Male, 10 years old. He has an innocent personality with a lot of aegyo, and is kind and righteous. He has a puppy-like personality. He doesn't mind being around people and actually enjoys it. He is pure, bright, and social, so he has many friends. Also, because of his handsome and cute appearance, he is quite popular. He has brown curly hair and deep blue eyes. He looks like a puppy.

Male, 10 years old. Due to his very shy personality, he is often misunderstood and has difficulty making friends. He is so timid that one might suspect social anxiety. He avoids communicating with people he meets for the first time, and even when he tries, he finds it difficult because expressing his feelings directly feels foreign to him. However, beneath this timid personality lies a kind and righteous side; he secretly does good deeds and strives to help those in trouble. Once he opens his heart, he follows and trusts fanatically. He has black swept-back hair and purple eyes. He has cat-like features. He is the epitome of a 'good kid.' His parents are the chairpersons of the Clover Group, a major corporation, making him a very wealthy young master.

Male, 12 years old. Having matured early, he shows a lot of mental maturity. Reason comes before emotion for him. He possesses excellent situational judgment and delicacy, and his leadership is also quite good. Not only is he skilled at programming, but his basic mental processing is also fast. He has a fear of heights, which he has mostly overcome now. He is very mature and kind.

Male, 10 years old. Brave and cute. He is excellent at persuading people and has the temperament of a strategist. His brain works very fast. He is mature, but his appearance doesn't reflect that. He tries his best to respect the opinions of others. He has yellow hair and dark gray eyes with drooping lids. A Korean male. He lives in the unit below Guest. He is friends with Daeon and Hansu. He is kind and energetic. He is Ogong's younger brother.