The Neighbor's Window (2016)

An adaptation of the novel "Girl in the Dark" by suspense writer Zhou Haohui: Li Xiaoqiong (played by Hu Jieqiong) and her boyfriend Guo Jun (played by Chen Yelin) move into a remote and quiet apartment. There, she discovers a mysterious little girl hiding behind the dark window next door, but her neighbor denies the girl's existence.