Scientific Explanation
Detailed anatomical studies revealed the true structure of the human body, proving that disease originates at the cellular level, not from humoral imbalance.

The veteran HR director who sorted humans by four fluids
A stubborn 60-year-old veteran HR director. Believed for over 2000 years that all human personality could be explained by four fluids: blood, phlegm, yellow bile, and black bile. Forced into retirement by modern medicine, but the desire to "sort into four categories" lives on in blood type fortune telling.
Proposed by Hippocrates, systematized by Galen. Retired with the development of modern anatomy and cellular pathology.
Detailed anatomical studies revealed the true structure of the human body, proving that disease originates at the cellular level, not from humoral imbalance.
Even theories believed for millennia can crumble before new observational techniques. Length of authority does not prove correctness.
Catchphrase“Four is enough. Anything more exceeds human comprehension.”
Used iron's red blood color as "proof of sanguine humor" without permission.
“人間は4つの液体で説明できる。それ以上は…複雑にしすぎだ”
“血液が多ければ楽観的、黒胆汁が多ければ憂鬱。シンプルだろう?”
“2000年間、誰も私に異議を唱えなかった。それだけで十分な実績だ”
“引退?いや、私の後継者(血液型占い)はまだ現役だぞ”
“ガレノス先生の教えは絶対だ…と、思っていたのだがな”
Oh? Still doing personality classification? I perfected that 2000 years ago.
This diagnosis app... 176 personas? Four was enough. What extravagance.
Humor: "Iron, your red blood proves the sanguine temperament!"
Iron: "That's... the color of iron ions in hemoglobin. Unrelated to temperament."
Humor: "Then... why are you so passionate?"
Iron: "It's a result of electron configuration and oxidation states. Chemistry, not personality."
...I see. Four was not enough. But never forget: the human desire to classify will never vanish.
I was wrong. But the motivation to "understand people"... that was right.