Oh god I'm getting old, I saw he was born in 2004 and my first thought was "CHILD LABOR???" but no 21-22 is a completely normal age to get into the hosting business
Blood Type Personality Theory is prevalent in East Asia to the point where it sometimes gets requested on job applications even.
Relevant bit from the wiki article:
According to popular belief, people with type A blood are friendly and kind but also obsessive and anxious, people with type B are spontaneous and creative but can be selfish, and people with type O are confident but stubborn and aggressive.
Thank you for explaining! I said my comment because of the stereotypes. Personally, I think being friendly can be any blood type. But I do think think that blood theory is right on how you solve problems