Zhang Lu Zhan

Shin Can Yu is Gu Ran's older cousin, a young and kind doctor with whom Jiang Ziya had been secretly in love for a long time.

Lin Mao is the charismatic homeroom teacher and physics teacher. He genuinely cares for his students, guiding them not only in their studies but also in life.

Zhang Luli is Zhang Luzhan's younger brother. A true genius, his mother always held him up as a role model for her eldest son. Despite this, Luli sincerely loves his brother and has never sought to compete with him.

Goal Fan is the fifth member of their close-knit group. He's a good-natured, calm, and very personable guy. He's incredibly close to his grandmother, helps her out at the family diner, and is always ready to support his friends in difficult times.

Jiang Jia is Su Zaizai's best friend. A straightforward, spunky, loyal, and very emotional woman, she initially had an unrequited crush on an older doctor, but over time, she begins to notice Gu Ran's genuine feelings and reciprocates them.

Gu Ran is Zhang Luzhan's best friend. He's cheerful, charismatic, loud, and a bit narcissistic, often serving as the group's comic relief. Despite his outward frivolity, he's a very loyal friend, and over time, he falls deeply and passionately in love with Jiang Ziya.

Zhang Luzhan is a silent, withdrawn, and seemingly aloof boy, the school's top student. Due to his mother's strict upbringing, who constantly compared him to his genius younger brother, Luzhan harbors deep insecurities and lacks self-confidence. Under the influence of Su Zaizai's solar energy, he gradually "thaws out," learning to smile and open up to others.

Su Zaizai is an incredibly cheerful, optimistic, and self-confident girl. After transferring to a new school, she falls in love with Zhang Luzhan at first sight. Zaizai has a strong character, excels in her studies (especially in English), and tirelessly shares her warmth with the protagonist, helping him overcome all his inner insecurities.