2. "Key No. 4" tells the story of the civilian hero Flashlight Man.
3. "Key No. 4" clearly tells us that what Mr. Jin Yong wrote is indeed a science fiction.
4. The director felt that the film was not scary enough, so he inserted a plot of a carnival haunted house.
5. Alien children also have to go to school, and the refuge is the school. It is easy for people to hide their identities, but they are also easy to be noticed, especially girls.
6. In "Key No. 4", I see the shadow of some works: "Fantastic Four", "Twilight", "Terminator Story", "Thunderbolt", "The Legend of the Condor Heroes"...
7 . Prediction of the title of the follow-up film of "Key No. 4": the second "5789, Found", the third "Six Gods".
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