The Music Box is the treasure of Yin-yang School, and it was somehow taken to Mohist School. The children realize they have to pass the test of the box to survive. A starry sky appears above them, and Yue-er finds out part of the secret with her knowledge about the Five Elements, the Twelve tones and Five sounds. She remembers how her mother has taught her to watch the stars, and find the vital star, the key to the test. Yue-er takes the box with her when they leave. Gongshu Chou manages to enter the Forbidden Land. The children come to a place with two roads. When they go to read the words separately, Shaoyu stands at the entrance to the Kingly Path, Tianming and Yue-er at the Chivalrous Path. (thetvdb.com)