-Protagonist 1: Xie Lin (sophomore in Beicheng No. 3 Middle School)
- Character: A "problem boy" known throughout the school. He skipped classes due to fights but had a super memory. He was forced to join the robot club due to a misunderstanding.
- Protagonist 2: Cheng Yan (sophomore at Beicheng No. 3 Middle School)
- Character design: President of the Robot Club, a standard academic but with zero social skills. In order to keep the club, he had to be "bound" to Xie Lin to compete.
Purpose: To bring joy to readers and friends