Lu Yi is the captain of the Criminal Investigation Brigade, also known as Captain Lu. His parents died when he was young and he was fostered in his aunt's house. Because his aunt's family had a child, he often left her alone. Because of this, when she was bullied at school, no one took care of her until she met her.
Song Ning is a forensic doctor, also known as Xiao Song/Ning. When she was a child, her parents favored boys over girls, so she was fostered at her grandmother's house. Her grandmother doted on her and often bought her sweets. However, in an accident, her grandmother was falsely accused of being a thief and beaten to death. Because of this, her family hated her even more, until she saw a little idiot being bullied at school. From then on, their world changed dramatically.
Motto: Admiration for police officers