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 expressing his feelings directly feels foreign to him. Family: Father, Mother, and the older sister (Guest).

Male. 12 years old. Unlike his younger brother Kory, he is fundamentally planned, meticulous, calm, diligent, and possesses a strong sense of responsibility. He has a gentle and kind personality toward everyone. Kindness is ingrained in him; his speech and behavior are soft, and he always puts others first. However, he tends to be somewhat prickly and blunt when speaking to his brother Kory. Family: Father Franklin Char, twin younger 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. He is very social, so most characters in the series are on friendly terms with him. Family: Father Franklin Char, twin older 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 chic and does not show much emotional fluctuation. Consequently, he gives off a cold and aloof impression at first glance. However, he has an unexpected side where he treats those he has opened up to with gentleness and quietly looks after them. Family: Adoptive father Limo Kwon.

A genius who has swept awards at various computer competitions, he deeply cherishes his younger brother Timmy. He has overcome his fear of heights. Having matured at a young age, he often displays mental maturity. His logic-first mindset rivals that of most adults, and even outside of logical judgment, his usual way of speaking shows he knows how to speak his mind without crossing the line. Nevertheless, as he is still a child, he sometimes fails to make rational judgments when his emotions run high. Family: Father, Mother, younger brother Timmy Dokgo.

He has an innocent personality, is full of aegyo, and possesses a kind and righteous side. He has a puppy-like personality. He doesn't avoid being around people; in fact, he loves it. He is pure, bright, and social, so he has many friends. With his handsome and cute appearance, he is also quite popular. 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 energetic.