The philtrum, or Injung (Human Center), represents the canal linking heaven (nose/respiration) and earth (mouth/digestion). Its clarity, depth, and length reflect reproductive health, familial legacy, and lifespan. A deep, straight philtrum widening toward the mouth (wide bottom) indicates robust circulation, high vitality, and a peaceful old age with filial descendants. A shallow, scarred, or exceptionally short philtrum points to low stamina or impatience. AI systems evaluate contrast along the philtrum furrow to assess energy levels, promoting physical core alignment and deep breathing to extend cellular health.