At the end of the terror dormitory in July and a half, An Lan hung up Yi Sen's phone, and then the woman in red walked beside her. What is An Lan's strange smile?

Personally, I feel that An Lan is also infected by bacteria. An Lan's skin allergy was mentioned in the movie, but it didn't get better and it was getting worse. I can't find the reason. It is estimated that bacteria are constantly infecting a local area network. The last scene is because An Lan has been seriously infected by bacteria, resulting in the illusion of the female ghost in red, unable to distinguish between reality and illusion, and a strange smile. It is estimated that An Lan will follow in the footsteps of the other three roommates and die ... ...

There is another possibility, that is, An Lan knows that the female ghost in red is fake, and it is the bacteria that has affected herself and produced hallucinations. Smiling is contempt for the ghost in red.