Panda brothers YIN and YANG were born to parents who are both doctors. These two brothers are both interested in medical sicence, but they have different understandings for the medical arts. They get angry with one another and treat each other like enemies. Older brother Yin believes QI is the original source of spirit. He studies body acupoint and herbal medicine to condition QI and blood. Younger brother Yang follows his understanding that a strong body is the foundation of life. He focuses on Chinese boxing and is good at surgery, bonesetting massage, as well as operative treatment and anesthesiology. These two new characters will appear in the included comic book. Together they will join the members of the main character team in building more exciting stories.