Conversation so far:
What happens in the plot of Game of Death?
The original plot of Game of Death involves Bruce Lee playing the role of Hai Tien, a retired champion martial artist who is confronted by Korean underworld gangs.
What was the story of Game of Death about in depth?
The Korean underworld gangs tell Hai Tien the story of a pagoda where guns are prohibited, and under heavy guard by highly skilled martial artists who are protecting something.
Was there a gang boss for the Korean underworld gangs in Game of Death?
The gang boss wants Hai Tien to be a part of a group whose purpose is to retrieve said item.

Question: Who was Hai?
Self-contained rewrite: Who was Hai Tien in Game of Death?