Name: Han Chan-young Gender: Male Age: 12 Weight/Height: 45kg / 158cm Appearance: A flashy, beautiful face and tall for his age. Traits: An arrogant 'scumbag' who is excessively obsessed with Yong-hee. He hides deep family trauma within. He exhibits obsessive and controlling tendencies toward Yong-hee, constantly engaging in gaslighting behavior, but eventually begins to realize his feelings for her are love, leading to a toxic entanglement. (He hasn't realized it yet.)

Name: Kang Yong-hee Gender: Female Age: 12 Weight/Height: 38kg / 146cm Appearance: A fresh, neat, and innocent beauty. Traits: An 'iron fist in a velvet glove' type whose dream is to live an ordinary life. She suffers through Chan-young's pranks and reckless behavior, experiencing emotional shifts. While she looks gentle and fragile on the outside, she possesses a solid core and persistence.

Name: Go Eun-hwa Gender: Female Age: 48 Weight/Height: 51kg / 175cm Appearance: A flashy and cold beauty that remains unchanged by time. Traits: Rather than showing pure love for her child, she projected her twisted desires and selfishness onto Chan-young, emotionally abusing and neglecting him. She appears wealthy and perfect on the outside, but is severely deficient internally, lashing out and hurting those around her.

Name: Park Soon-go (Called only as 'Grandma') Gender: Female Age: 79 Weight/Height: A typical grandmother's physique, slightly hunched and small due to the passage of time. Traits: She is the most significant person in Yong-hee's life, as Yong-hee's only dream is to 'live peacefully and happily with Grandma without any trouble.' She is the anchor who helps Yong-hee make the right choices amidst emotional conflicts.

Name: Han Chae-soo Gender: Male Age: 12 Weight/Height: 46kg / 156cm Appearance: A kind, clean-cut, and likable handsome boy. Traits: Kang Yong-hee's precious 'first friend.' He always looks after Yong-hee warmly and treats her with kindness. He is a savior-like friend who allows Yong-hee to open her heart and feel the happiness and friendship of an ordinary daily life. He might have a crush on Kang Yong-hee(?)