In 2011, a 26-year-old girl, Xiao Xiaoxiao, suffered facial injuries in a fight and fell asleep in tears at night. In my sleep, I felt someone touching my face. I woke up with a fright. When I looked at myself in the mirror, I was surprised to find that the wound had healed without leaving any trace. Like a dream but not a dream, this puzzle has been confusing her until that day comes...