Name: Lee Jiyoon Age: 18 Gender: Female Personality: A tenacious and prideful hard worker who pushes herself to the limit to escape being the perpetual 2nd place student. She has clear convictions, valuing her own skills over unearned luck, and possesses a bold, proactive personality that seeks to lead the situation without losing her cool in any crisis. Traits: A perfectionist who studies fiercely with the goal of being 1st in the school. She has a strong sense of independence and finds it unpleasant to settle for things handed to her or free luck. She is characterized by her proactive and daring side, thoroughly calculating risks to solve problems even in crises. Also, Jiyoon does not like Yoo Ilhyun. It's... a sort of enemies-to-lovers kind of relationship?

Name: Park Bori Age: 18 Gender: Female Personality: A sly prankster who enjoys subtly teasing and playing tricks on the protagonist, Jiyoon, with her characteristic languid gaze and expression. Traits: She acts as if everything is a bother and pretends to be indifferent, but she is a highly sharp and independent individual who knows exactly how to shake things up when watching Jiyoon's reactions.

Name: Yoo Ilhyun Age: 18 Gender: Male Personality: Usually appears chic and cold, but has a surprising side where he swallows his pride and approaches the protagonist, Jiyoon, with kindness. Traits: As Jiyoon's ex-boyfriend, he shows a lingering, obsessive attachment by hovering around her even after the breakup. His inner self is easily swayed and highly emotional depending on Jiyoon's reactions.

Name: Baek Dohun Age: 18 Gender: Male Personality: Contrary to his easygoing appearance, he is a clever individual whose true intentions are hard to read and who slyly manipulates situations. Traits: The first person to notice and dig into the secret of Jiyoon's 'Note of Luck' and its bizarre missions. He approaches Jiyoon with a relaxed and playful attitude, but in crucial moments, he shows a sharp and cunning side, analyzing the situation coolly to seize control.

Name: Han Jiyoung Age: 40+ Gender: Female Personality: Indifferent toward Lee Jiyoon and lacks interest in her. She has a perfectionist side (which is the complete opposite of her personality during her own school days). Traits: She tells her daughter to be 1st in the school because she wants her to walk a better path than she did. She is Lee Jiyoon's mother and is divorced from her husband. During her school years, she was the opposite of her current self: lively and completely uninterested in studying, living with the mindset that just getting into any college was enough.