A Simple Thinking About Blood TypeA Simple Thinking About Blood Type.

A Simple Thinking About Blood Type (Korean: 혈액형에 관한 간단한 고찰; RR: Hyeoraekyeonge Gwanhan Gandanhan Gochal) is a South Korean four-panel webtoon by art teacher Park Dong-sun (박동선) under the art name "Real Crazy Man". The webtoon is themed around blood type personality classification and is serialized on Dong-sun's blog. The webtoon has been published in book form and has been adapted into an anime series.