Mogan Mountain is a scenic area in Zhejiang Province, China, known for its lush greenery and picturesque landscapes. The 'flower and tree deep entrance case' likely refers to a specific design or architectural feature of an entrance to a property or building within this area. This could involve the use of dense plantings, traditional Chinese garden elements, or unique landscaping to create a welcoming and immersive atmosphere. For more detailed information, specific references to the case study or project would be necessary.