This is a tragic story of migratory birds, lost birds, and resident birds, and it is also like a musical of birds. Millions of years ago, in the rainforest of Gondwana, a regrettable incident occurred among the giant birds, tree spirits, upright people, and flocks of birds. Later, the crust split, the plates drifted, and between life and death, love and hate, the flock of birds made a promise to the surviving giant tree spirit. As a result, the flock of birds migrates every year, goes through dangers, and constantly repeats the tragic story to fulfill this promise.
