This is the unique aspect of constitutional theory, that constitution is determined by organ structure. This phenomenon is the same with other constitutions. The Han-Soyangin has the opposite structure of the Yol-Soumin, the Yol-Taeyangin that of the Han-Taeumin and the Han-Taeyangin that of the Yol-Taeumin. In other words, if you know thoroughly only four constitutions of the eight, you can easily understand the other four constitutions.

The kidneys are the largest organs in the Han-Soumin, so naturally the lower jiao, the group with the kidneys, is the most developed; namely, the kidneys, large intestine, sex organs, mouth, bladder, bones. The liver follows as relatively large organ, so its group, the lower middle jiao, is relatively well developed: the liver, small intestine, navel, waist, and hypodermic tissues.

Lungs are relatively small organs with the Han-Soumin, so it's group, the upper jiao, is not well developed: lungs, esophagus, tongue, ears, brain, skin. Pancreas is the smallest organ, so its group, the upper middle jiao, is least developed: pancreas, stomach, breasts, eyes, spine, muscles.

Because the upper and upper middle jiaos are not well developed, the Han-Soumin has relatively narrow chest and shoulders. The waist is wide due to the large liver and the buttocks are large because of the largest kidneys. The lower parts of the body are most developed. So this body shape looks the most balanced. Especially a woman with a feeble upper body, well developed lower body with long legs has the most perfect and beautiful body shape.

However, because of the not well developed upper middle jiao the Han-Soumin has a narrow chest and small or immature breasts. Of course, many have beautiful breasts, because that does not depend only on their size.

The main characterization of this constitution is the pancreas as the smallest of the organs. Therefore, the Han-Soumin is the least likely to become overweight.
The Yol-Soyangin has the largest pancreas and because of excellent digestion can gain weight easily and in serious cases become obese. In contrast, the Han-Soumin can never become fat because of the smallest pancreas and weak digestion, even if he eats well.
This is supported by his kidneys as the largest organs, so his elimination is smooth. The organ structure of weak digestion and strong elimination indeed does not make the Han-Soumin fat. Even if he becomes his heaviest, his weight remains only ordinary.
The Han-Soumin, therefore, has the thinnest body shape of all eight constitutions. Many people are worried about their excess weight or corpulence, but the Han-Soumin even wishes to put on weight.

In other words, those who have more or less fat or corpulent bodies, and those who are thin when young but later become corpulent, are never the Han-Soumin.

Nevertheless, it would be a mistake to suppose that everyone with a thin or svelte body is a Han-Soumin, because there are also other constitutions besides the Han-Soumin who do not become overweight. A person's constitution must be judged considering various constitutional characteristics. Judging only by corpulence is not the right way.

The Han-Soumin is thin, so sweating a lot is not healthy and it is not good for him to intentionally make himself sweat often in a sauna. If he often sweats, that is an indication that he is not well and should be regarded as a symptom of an oncoming serious illness. His pancreas is the smallest, so irregular or excessive eating can easily damage his digestive organs. If he usually eats and digests well, that means that he is in good health.

Muscles belong to the pancreas group of upper middle jiao, so the Han-Soumin's muscles (the smallest pancreas) are the least developed. It is therefore difficult for him to achieve much athletic success due to his constitutional specific character.
But he has a strong lower body, so he can show his outstanding abilities in sports that don't require great muscle strength, such as artistic skating.

The eyes, too, belong to the pancreas group, so generally Soyangin has strongly brilliant eyes, but Soumin has melancholy eyes like those of someone who just stopped crying. Soumin has quiet eyes, not very impressive, that give a soft feeling.

Kidneys and liver of Soumin are well developed. Therefore, as the body is thin and long, so is the face not round but oval. That is the typical face of Soumin. We could say even, that there aren't any Soumins among those with round or wide faces, the same as among fat people.

The largest kidneys influence strongly the kidney's group, the lower jiao, so the uterus, in the kidney group, works well. Even though a woman looks thin, she can well give birth to many children. She starts to menstruate at an earlier age than others, and has menopause later. A man has much energy, but much energy doesn't mean sex urge. Indeed, sex urge can be very strong with Soyangins whose energy levels are low.

Bones are in the kidney group and are relatively thick and solid, so the spine doesn't curve much even in old age.

Liver and kidneys, that is the lower and lower middle jiaos, are well developed, so the Han-Soumin may be tall. But generally the Han-Soumin doesn't put on much weight nor grow smoothly because of the smallest pancreas, so many are short.

The Han-Soumin has a weak upper body and strong lower body. Sports that strengthen the weak upper body are especially good, such as badminton, tennis, ping-pong, etc.

The Yol-Soyangin has the most yang character, while the Han-Soumin has the most yin. This has great influence on the physiology, pathology and temperament.

The Yol-Soyangin has the greatest warmth and prefers anything cold, while the Han-Soumin has the greatest cold and is very sensitive to cold and often suffers from cold in the extremities.
Therefore the Han-Soumin prefers warm food. If he eats too much food with cold character, that will give him diarrhea. His diarrhea is different from that of Soyangin, caused by weak intestines, and is not cured the same way.

Ginseng and honey, with a warm medical effect, are very good for Soumins. Also foods with warm character, such as chicken, potato, ginger, are appropriate. The more he eats those kinds of foods, the more it warms his body which from birth is inclined toward cold. That's why it is good for his health.

Cold energy of the Han-Soumin influences also his temperament and makes him inactive, prudent, scrupulous, introverted. Of course, this is the opposite of the Yol-Soyangin.

Generally the Han-Soumin is quiet, gentle and has great aplomb. In personal relations he tends to choose his companions rather than making friends easily with anyone at all. In contrast to Soyangin, who begins anything with self confidence and easily gets tired of it in the middle, Soumin decides only after thinking about it, solidly prepares and constantly pushes it forward. Therefore he rarely fails. In contrast to Soyangin, who acts before thinking, Soumin likes to sink into thought, barely revealing his feelings, and prefers comfort and ease to change and risk.

Due to his strong yin character, Soumin tends to avoid fighting directly against a problem, in contrast to Soyangin who tries to directly confront and solve it. If the Soumin's feelings or self respect are hurt, he doesn't directly express his emotions on the spot, but reacts more sensitively and doesn't easily forget the wound.

In contrast to Soyangin, who speaks narcissisticly, loudly and excitedly, Soumin speaks with aplomb, quietly and persuasively with a soft voice. The Han-Soumin is scrupulous and self centered, so he often sighs and is very sensitive to everything. He can easily suffer form melancholy, neurasthenia and insomnia. He has strong individualism, egoism and self respect so he is very averse to other's interventions into his affairs.

The Soumin temperaments described by Lee Jema in his book concern mostly the Han-Soumin.

The Han-Soumin looks mild, humble and weak, but also can be also strong and self confident inside. This is the opposite of Soyangin, who looks strong, but is softhearted, warm and romantic inside.

Generally the Han-Soumin is tranquil, thoughtful and precise. He has great intelligence and thinks deeply about a subject. He can be outstanding in religion, philosophy or pedagogy.

It is important not to suppose that every inactive or introverted person is a Han-Soumin just from their temperament. Indeed, it isn't possible to distinguish constitutions only by temperament, not least because individual character and temperament forms after birth with much influence from the environment and life conditions. There are many Han-Soumins who have a merry and active character.