Why does Shaoqian like to touch Tong Xue hair so much? Does he have a hair fetish?
I don't think the director nor the writer intended to imply that Shaoqian has a fetish for Tong Xue's hair. There were several scenes in the drama that depicted Shaoqian touching Tong Xue's hair. These scenes pinpoint the fact that it was the only intimate gesture Shaoqian could subtly make without Tong Xue's notice. In the novel, he actually just wanted to extend his arm out to touch her quietly from behind. Just when he was about to succeed, he restrained himself, pulled back his hand, and his fingers ended up touching her long flowing hair instead.
This gesture shows that Shaoqian is too afraid to exhibit his most private and genuine feelings in front of Tong Xue. Tong Xue's long hair, I think, symbolically represents the distant connection they have. Like a timid child, Mo Shaoqian is definitely very raw in the area of love, and very awkward in the way he chooses to love. His IQ is extremely high, but his EQ is on a whole different level