Other than the prologue we never really see their first meetings, the start of this series they seem to already be quite familiar with each other so the bet was probably before thatwhat bet was she referring to? i just re-read the whole thing and she never brings that up
Oh they didn't bet anything. She was singing a song from a famous Vietnamese band she liked and was mentioned in the story ( "sweet" band).Other than the prologue we never really see their first meetings, the start of this series they seem to already be quite familiar with each other so the bet was probably before that