| Ja Kanji: | 血液型くん! |
| Ja Romaji: | Ketsuekigata-kun! |
| Genre: | Comedy |
| Author: | Real Crazy Man |
| Publisher: | Earth Star Entertainment |
| First: | January 26, 2013 |
| Volumes: | 5 |
| Type: | tv series |
| Director: | Yoshihisa Ōyama |
| Music: | Daisuke Hiraki |
| First: | April 7, 2013 |
| Last: | March 29, 2016 |
| Episodes: | 49 |
A Simple Thinking About Blood Type is a South Korean 4-panel webtoon by art teacher Park Dong-sun 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.
A Simple Thinking About Blood Type was first serialized on Dong-sun's blog as a webtoon. Japanese publisher Times Culture later published the comic in book form as in 2013.[1]
A short anime adaptation was made by Japanese production houses Assez Finaund Fabric and Feel in 2013, with a second season in January 2015. Zexcs co-produced a third season, which began airing in October 2015. A fourth season aired in 2016.[2]
Each of the voice actors also represents their own blood type.