Today is the International Day for the Conservation of Mangrove Ecosystems. If you take a bird's-eye view of Shenzhen Bay (Deep Bay), which straddles Shenzhen and Hong Kong, you will definitely notice a forest of various types of mangroves. Mangroves help protect coastal communities around the world and provide shelter for many species. Today, however, mangroves are disappearing due to human activities and climate change. How can we protect these coastal guardians? How can we create a future where people and mangroves can thrive? Here we present the mobile documentary "Spring Comes to Mangrove Forests" to pay tribute to these rare, spectacular and productive ecosystems on the border between land and sea.