In traditional Korean folk medicine, it refers to the acupoint where acupuncture is performed to regulate the body’s energy when experiencing indigestion or discomfort.
After massaging the back, it is an act of pricking the area where the fingernail begins with a needle or acupuncture to draw out a small amount of blood.
“When ‘Sagwan’ is pricked with a needle, indigestion is quickly relieved.”