Such a recent hit in mainland, and I guess it's more of a trendy success more than anything else. The general framework seems to be inspired by The Invisible Guest, yet the mystery not as intricate and the story not as convincing. The former issue being some of the events, scenes, and shots overly dramatized by the sound effect or cinematography, while the latter due to the overall mediocre performances. Also, the ending is stacked with a superfluous amount of twists and twines, which simply reflects some of the logical errors prior. It seems that the intention of the movie is quite clear: to tell a convoluted mystery from an intriguing perspective with a justified moral.