The Yol-Soumin has an organ structure with kidneys as the largest, lungs relatively large, liver relatively small, and pancreas the smallest. This can be written as kidneys > lungs > liver > pancreas.

This structure is the opposite of the Han-Soyangin's, which is pancreas > liver > lungs > kidneys.

As seen below, the Yol-Soumin is in the opposite position of the Han-Soyangin and therefore in all ways is opposite to the Han-Soyangin.

The Yol-Soumin's kidneys are the largest organs, so naturally the kidney group, the lower jiao, namely the kidneys, large intestine, sex organs, mouth, bladder and bones, are the most developed. The lungs are next largest of the organs, so their group, the upper jiao (lungs, esophagus, tongue, ears, brain and skin) is relatively well developed.

Liver is a relatively small organ in the Yol-Soumin, so its group, the lower middle jiao (liver, small intestine, navel, nose, waist, hypodermic tissues) is not well developed. Pancreas is the smallest of the four organs, so its group, the upper middle jiao (pancreas, stomach, breasts, eyes, spine, muscles) is the least developed.

The Han- and Yol-Soumins both have kidneys the largest and pancreas the smallest, but they are nevertheless different in body shape, because the relative size of the two middle organs, liver and lungs, is different.

Firstly and most importantly, although both have the organ structure 'kidneys > pancreas', the Han-Soumin is characterized by the largest kidneys, while the Yol-Soumin is characterized by the smallest pancreas. In other words, the Yol-Soumin is a constitution caused by a pancreas that is too small, while the Han-Soumin is caused by kidneys that are too large.

If these constitutions become ill for some reason, the small pancreas of the Yol-Soumin gets weaker and the main method of cure is to adjust that weakened pancreas, while the overly large kidneys of the Han-Soumin become stronger, so the main cure for the Han-Soumin is to adjust those strengthened kidneys.

This can be easily expressed as follows.

liver

pancreas

Above: constitution with too small a pancreas: the Yol-Soumin
Below: constitution with too large kidneys: the Han-Soumin

As seen above, although the Yol-Soumin has the smallest pancreas the same as the Han-Soumin, the two pancreases cannot be regarded as being equally large. It is evident that the Yol-Soumin's pancreas is smaller.

Although the Yol-Soumin has the largest kidneys same as the Han-Soumin, the two kidneys are not considered equally large. It can be seen that the Han-Soumin's kidneys are larger.

Although the Yol-Soumin's pancreas is also small, it is not as small as the Han-Soumin's, so the Yol-Soumin can gain weight to some degree, in contrast to the Han-Soumin, who is the thinnest because of the weak functioning of the pancreas and stomach. However, the Yol-Soumin doesn't become corpulent, because his pancreas is indeed a small organ. In other words, you won't find Yol-Soumins among fat people.

The Yol-Soumin is characterized by the largest kidneys. Therefore the lower jiao, the buttocks and lower body, are most developed. Due to large lungs, the upper jiao, the shoulders, are well developed. In summary, the Yol-Soumin has a narrow chest, in contrast to the Han-Soumin, but relatively wide shoulders. Because of the largest kidneys, many women have large buttocks and many men have a large penis.

Bones belong to the kidney group. The Yol-Soumin with the best developed kidneys has strong and solid bones, so he is resistant to osteoporosis and his spine doesn't curve even in old age. Due to the large kidneys a man is very energetic and a woman begins to menstruate at an early age and has menopause late.

It is not good for a Yol-Soumin to drink much alcohol due to his small liver. If he does drink, whiskey and vodka are better than beer, which has a cold character.

Soumin puts on weight mainly on the lower body, while Soyangin on the upper body. The Yol-Soumin puts on weight and strength at the buttocks and lower body more than the Han-Soumin, and can display good capability in such sports as skating and skiing.

The Yol-Soumin's pancreas is a small organ and he has poor digestion, although not as poor as the Han-Soumin. If he eats too much at a time or eats irregularly, he can easily suffer from acute or chronic digestive disease such as gastritis or gastroptosis. He has a cold body, so he is sensitive to cold and suffers from cold extremities.

The organ structures of the Yol-Soumin and the Han-Soyangin are opposites.
The Han-Soumin is easily distinguished by the thinnest body structure, but the Yol-Soumin often doesn't look so typically Soumin, because he is to some degree wide-shouldered and stocky. Similarly, the Han-Soyangin doesn't look like a typical Soyangin. If a little heavy, he looks similar to a Taeumin, but if thin, he looks like a Soumin.

Nevertheless, the Yol-Soumin is indeed a Soumin and has characteristics of Soumin such as brilliance in the eyes, the general look of the face, the narrow chest, and the temperament. So they are relatively easily distinguished through detailed observation.

The Yol-Soumin is mixed with Taeyangin and to some extent has Taeyangin characteristics, among them a rich voice. Many Yol-Soumins are world famous singers or opera singers.

He also has a somewhat Taeyanginesque temperament and is more extroverted and active than the Han-Soumin. However, that is in comparison only with the Han-Soumin. The Yol-Soumin also is Soumin and still has Soumin characteristics and temperament as classified by Lee Jema.

The Yol-Soumin easily becomes upset and melancholic, but is relatively free from insomnia. Many great thinkers and philosophers are Yol-Soumins.