Personally, I don't think Jacob is the murderer. There are two main reasons: 1. Please pay attention to about 19:42 of s01e02. Here is a close-up of the lens to see that the mobile phone Jacob uses is an iphone. According to Rian Johnson, director of Knives Out and Star Wars: The Last Jedi, Apple has strict rules in its product implant contracts that its devices cannot be used by any bad guy . So from this point of view, Jacob's suspicion is directly ruled out. But there are exceptions. For example, the villain of House of Cards, Frank Underwood, uses an Apple device.
2. The theme of this play is crime suspense. Although the replies left to Jacob on the social network show that the murderer is suspected of pointing to Jacob, but from the perspective of suspense, the screenwriter does not need to directly reveal the real murderer from the beginning. (I have not been in contact with the original work, so I am just guessing. You are welcome to discuss together, I hope it will not affect your soybean oil viewing experience)
Add two points: 3. At the end of s01e02, it can be noticed that another suspect, the one with a history of sexual assault, has a photo of the deceased in his mobile phone, and after some hesitation, he deleted the photo. (Note that an Android phone is used here).
4. This drama is produced by Apple+, so there should be a setting that the villain cannot use Apple devices. After all, it is Apple's own drama, so you will still pay attention to the image
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