Who is Chopstick from Lost Names: Scenes from a Korean Boyhood and what is their importance?

Chopstick is the nickname of a Japanese teacher that told them they would have no class that day. Chopstick is the other one of two characters identified by name rather than nationality, title or role. Ironically, this named teacher was responsible for reviewing a list of new and old names. He called old names of those excused to go home and get their new registered names.