Li Guiyu knew that Zhao Ruqing was a coward when he first saw him. Later, when Li Guiyu entered Zhao Ruqing's home from the orphanage, he had to call him brother Ruqing even though he didn't want to show it to his face.
When Li Guiyu came to Zhao Ruqing's house, he didn't like to talk and only liked to hide in the study. Zhao Ruqing often called Li Guiyu "nerd", and later called Li Guiyu "nerd" for convenience. Of course, this call can only be made by Zhao Ruqing. If it were anyone else, Zhao Ruqing would not comply.
Intention: persist