What episode is the missing child Kelly injured?

The third episode. According to the inquiry about the missing children broadcast by Mango TV, in the third episode, the window on the second floor of Yang Yuanjia was opened, and Momo suddenly disappeared before dinner. Surveillance shows that the only figure who comes and goes without a trace is Kelly, a thin and plain girl. So the missing child Kelly was injured in the third episode. The play tells the story of mutual redemption between a group of children and their parents who have long been absent from the company of Origin and Fate.