This book is a collection of daily nature essays that paint a vivid picture of life in harmony with the Changbai Mountain, which is on the border between China and the DPRK. On May 5, 2007, nature writer Hu Donglin moved to the Changbai Mountain area and lived there until he was hospitalized due to illness on October 31, 2012. Throughout this period, he insisted on recording his daily life and writing, capturing the essence of his encounters with the local hunters, mountain dwellers, and the diverse wildlife, from birds and animals to fish, insects, mushrooms, and a variety of flora. Rhythms of Changbai: A Four-Season Mountain Journal is a rich anthology of over 200 nature diaries, chronicling the author's experiences over six years. This book invites young readers to step into the pristine forests of the Changbai Mountain, home to one of the world's most intact and representative temperate old-growth ecosystems, making it one of the most biodiverse regions in the Northern Hemisphere at its latitude. Hu Donglin's daily walks in this area, hailed as "gene bank of species', are filled with encounters with familiar creatures—lively hazel grouse, solitary and aloof lynxes, and melodious songbirds. The forest is not only home to a vibrant animal life but also to rare trees and plants that display remarkable resilience, with fungi beneath the trees taking on countless fascinating forms. Walking through the forest, one could spot 20 bird species in a single day, watch mandarin ducks and wild ducks playing in lakes, observe squirrels fighting over territory, or even come across rare bioluminescent fungi at night. Every moment of discovery was faithfully and thoroughly recorded by the author.