Thanks very much for playing our game and sharing your thoughts! We're really glad you were able to relate to the characters.
The wtf/diu choice doesn't really make a difference -- it's just there since "diu" might be something the player character would say, but players not from Hong Kong might not know what it means, so the "wtf" option is there to make things clearer.
(We're both permanent residents of HK, but unfortunately we're based in New York and California at the moment. It'd definitely be cool to get more involved with the HK game dev community if we were ever back in town, though!)