Playing Dreams in the City, I Can Upgrade Infinitely

Respiration lv1: Inhale various gases and exhale carbon dioxide like ordinary people. Breathing lv2: When inhaling, you will not inhale various harmful gases in the air and spit out carbon dioxide. Breathing lv3: When inhaling, you will not inhale various harmful gases in the air and spit out various harmful substances in the body. Breathing level 4: Can breathe through skin and underwater. Breathe level 5... Breathing can make you stronger, then I blink?