Blood and personality 2/4

An old belief (at least in my opinion)

The idea was to be able to tell a person's seikaku2 By simply knowing the antigens present in one's ketsu3 Although I can't remember the explanation for each breed I'm sure Bs are wonderful people, and other Bs would concede

Notes:

2 Seikaku（性格）＝ personality 3 Ketsu（血）＝ blood (more often pronounced as "chi" when used by itself, however, for rhyming purposes, I opted for the pronunciation "ketsu")