Bajie, Fudi, Tiaotiao Shu, and Yu'er accidentally arrive at the legendary tree city—"Fuyuan City"! This marvelous city is built in layers upon a giant tree, with the Firefly Square at its center, surrounded by skyscraper cars, clubs, and bubble baths. The happy quartet holds a concert at Firefly Square, using music to "break into" Dudu City. With the help of Principal Raccoon, they find their own home in Dudu City, and the happy quartet begins their colorful life there.