Why didn't the little boy touch his head on the way home in Wan Li?

The reason of faith. The Return of Wan Li is a feature film directed by Rao Xiaozhi, supervised by Frant Gwo and Wang Hongwei, starring Zhang Yi, Yin Tao and Zhang Zixian and Cheng. In the plot, Zong Dawei doesn't let Cheng Lang touch the child's head, because the child is Libyan in the play. For religious reasons, the head of the Islamic world is a sacred part, and it is disrespectful to touch others' heads.