The Brother Bamboo Flute is from Teenage Xitong Series.

Dingding almost has an accident when he secretly trains himself to master a somersault skill. Fortunately, an elder brother saves him. What appears much more interesting is this elder brother can change his body shape. Sometimes he is just an elder brother walking in the field with his cow and bamboo flute. Sometimes he is a swordsman who is separated from his parents for many years. Sometimes he becomes a handsome boy who sings folk music for Cuicui. This is a story about love and saving. The brother Bamboo Flute lost his mind and he can't lead a normal life. To his comfort, neither his mother nor his neighbors look down upon him or laugh at him. Instead, they hold out their hands to help him and open up to hug him.