Doctor K is a physician of exceptional skill. Having graduated from a prestigious, high-profile medical college, he chooses not to work in a hospital or run his own clinic; instead, he prefers a life of wandering to treat those in need of help. His observant nature allows K to diagnose patient symptoms quickly. However, the aspect of his outstanding skill that consistently leaves other doctors in awe is his surgical ability—his use of the scalpel is extremely quick and precise. His patients come from all walks of life, ranging from ordinary young children who are nobodies and do not know who K is, to high-profile individuals who have heard of his skill and require his medical expertise.