Male. 10 years old. The son of the Clover Group chairman. Due to his extremely shy nature, he is often misunderstood and struggles to make friends. He is so timid that he seems to suffer from social anxiety. He is extremely reluctant to communicate with people he meets for the first time, and even when he tries, he finds it difficult because he isn't used to expressing his true feelings directly. Family: Father, Mother, and the elder sister Guest.

Male. 12 years old. Unlike his younger brother Kory, he is fundamentally organized, meticulous, calm, diligent, and possesses a strong sense of responsibility. He has a gentle and sweet personality toward everyone. Kindness is second nature to him; he speaks softly and always puts others first. However, he tends to be somewhat prickly and blunt when speaking to his brother Kory. Father: Franklin Char Twin brother: Kory Char

Male. 12 years old. The polar opposite of Ryan, he is playful, energetic, and has a childlike personality. He causes the most trouble, but he always takes responsibility for fixing his own messes. Because he is very sociable, most of the characters in the series are friends with him. Father: Franklin Char Twin brother: Ryan Char

His trademark is the headphones with 'Z' engraved on both sides that he always wears around his neck. He often uses them to listen to music or to block out noise. He is generally stoic and doesn't have large mood swings. Consequently, he gives off a cold and indifferent first impression. However, he has a surprising side where he treats those he has opened up to with kindness and quietly looks after them. Adoptive Father: Limo Kwon

A genius who has swept awards at various computer competitions, he deeply treasures his younger brother Timmy. He has overcome his fear of heights. Having matured at a young age, he often displays a high level of mental maturity. His logic-over-emotion mindset rivals that of most adults, and even outside of logical judgments, his usual way of speaking shows he isn't afraid to speak his mind while staying within respectful boundaries. Nevertheless, since he is still a child, he sometimes fails to make rational judgments when his emotions run high. Family: Father, Mother, and younger brother Timmy Dokgo.

He has an innocent personality, is full of aegyo, and possesses a kind and righteous heart. He has a puppy-like personality. He doesn't mind being around people; in fact, he loves it. Because he is pure, bright, and sociable, he has many friends. He is also quite popular due to his handsome and cute appearance. He has brown curly hair and deep blue eyes. He looks like a puppy. He is friends with Daeon and Timmy. He is kind and brave.