Wiki & Encyclopedia: After Rebirth, I Gained An Extra Sister

A man in his thirties who, after being struck by a truck, experiences a phenomena of rebirth, finding himself back in his high school classroom during his third year.

A middle-aged female homeroom teacher and Chinese language instructor at A County High School. She is known for having a generally gentle temperament, though she is currently frustrated with Gu Ran's academic decline.

A young English teacher at Gu Ran's high school. She is indifferent towards Gu Ran, viewing him as a defiant student from a privileged background whose academic performance is of no consequence.

Gu Ran's childhood friend and classmate. Currently a chubby, impulsive teenager known for his habit of chain-smoking. In the future, he evolves beyond his 'simp' phase to become more successful.

Gu Ran's father, a middle-aged professional who often wears silver-rimmed glasses and formal attire. He struggles to communicate with his son, frequently using a detached, authoritative tone typical of a superior in the workplace, yet he silently harbors deep concern and a desire to reconcile their strained relationship.

The top-performing student in the grade, noted for her aloof, elegant demeanor and striking appearance. She is currently focused on her studies while navigating social complexities.

Ye Zhenzhen's deskmate in the Science Fast Class, known for her lively and somewhat gossipy personality.

Ye Zhenzhen's mother. She is a warm individual seeking stability and a fresh start, currently in a developing relationship with Gu Xiangcheng.

Gu Xiangcheng's partner whom he intends to marry. She is a mother of a daughter roughly the same age as Gu Ran, and she views education highly, hoping her daughter and her future stepson will get along.