Occlusion is the most basic factor in dentistry. However, there are several different theories. They look different, but the goal is the same? How can a dentist set an ideal occlusion? What is the landmark in oral anatomy? How can a dentist have an appropriate 3D image of occlusion? Are there really science factors in dentistry? What is the truth? Sounds very confusing? Abe's Shilla system must be a solution. Its philosophy is crystal clear without ambiguous explanations. It's really persuasive and useful in actual planning in treatment. I believe I have helped some patients who had eating problems, using the theory. They said they felt A-one after the treatment. I want to continue pursuit of happiness for my patients.